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My problem is that the camera is not recognized.

I have tested Kamara with Chese and the program runs with videos. I have already googled and found nothing that fits

Sorry for my bad English

#include <opencv2/opencv.hpp>
#include <opencv2/tracking.hpp>
#include <opencv2/core/ocl.hpp>
#include <opencv2/tracking/tracker.hpp>
#include <opencv2/tracking/tldDataset.hpp>
#include <iostream>
#include <stdio.h>
using namespace cv;
using namespace std;

// Convert to string
#define SSTR( x ) static_cast< std::ostringstream & >( \
( std::ostringstream() << std::dec << x ) ).str()

int main(int argc, char **argv)
{ // List of tracker types in OpenCV 3.4.1
string trackerTypes[8] = {"BOOSTING", "MIL", "KCF", "TLD","MEDIANFLOW", "GOTURN", "MOSSE", "CSRT"};
// vector <string> trackerTypes(types, std::end(types));

// Create a tracker
string trackerType = trackerTypes[2];

Ptr<Tracker> tracker;

if (CV_MINOR_VERSION < 3)
{
    tracker = TrackerMIL::create();//        tracker = Tracker::create(trackerType);

}
else
{
    if (trackerType == "BOOSTING")
        tracker = TrackerBoosting::create();
    if (trackerType == "MIL")
        tracker = TrackerMIL::create();
    if (trackerType == "KCF")
        tracker = TrackerKCF::create();
    if (trackerType == "TLD")
        tracker = TrackerTLD::create();
    if (trackerType == "MEDIANFLOW")
        tracker = TrackerMedianFlow::create();
    if (trackerType == "GOTURN")
        tracker = TrackerGOTURN::create();
    if (trackerType == "MOSSE")
        tracker = TrackerMOSSE::create();
    if (trackerType == "CSRT")
        tracker = TrackerCSRT::create();
}


// Read video
VideoCapture video ;
video.open(-1);//video.open( "/dev/video0");

    cout << "OpenCV version : " << getBuildInformation()  << endl;
// Exit if video is not opened
if(!video.isOpened())
{
    cout << "Could not read video file" << endl; 
cout << "OpenCV version : " << CV_VERSION << endl;
    cout << "Major version : " << CV_MAJOR_VERSION << endl;
    cout << "Minor version : " << CV_MINOR_VERSION << endl;
    cout << "Subminor version : " << CV_SUBMINOR_VERSION << endl;
    return 1; 
} 

// Read first frame 
Mat frame; 
bool ok = video.read(frame); 

// Define initial bounding box 
Rect2d bbox(287, 23, 86, 320); 

// Uncomment the line below to select a different bounding box 
// bbox = selectROI(frame, false); 
// Display bounding box. 
rectangle(frame, bbox, Scalar( 255, 0, 0 ), 2, 1 ); 

imshow("Tracking", frame); 
tracker->init(frame, bbox);

while(video.read(frame))
{     
    // Start timer
    double timer = (double)getTickCount();

    // Update the tracking result
    bool ok = tracker->update(frame, bbox);

    // Calculate Frames per second (FPS)
    float fps = getTickFrequency() / ((double)getTickCount() - timer);

    if (ok)
    {
        // Tracking success : Draw the tracked object
        rectangle(frame, bbox, Scalar( 255, 0, 0 ), 2, 1 );
    }
    else
    {
        // Tracking failure detected.
        putText(frame, "Tracking failure detected", Point(100,80), FONT_HERSHEY_SIMPLEX, 0.75, Scalar(0,0,255),2);
    }

    // Display tracker type on frame
    putText(frame, trackerType + " Tracker", Point(100,20), FONT_HERSHEY_SIMPLEX, 0.75, Scalar(50,170,50),2);

    // Display FPS on frame
    putText(frame, "FPS : " + SSTR(int(fps)), Point(100,50), FONT_HERSHEY_SIMPLEX, 0.75, Scalar(50,170,50), 2);

    // Display frame.
    imshow("Tracking", frame);

    // Exit if ESC pressed.
    int k = waitKey(1);
    if(k == 27)
    {
        break;
    }

}
video.release();
destroyAllWindows();
}

OpenCV version : General configuration for OpenCV 4.0.0-pre ===================================== Version control: 4.0.0-beta-41-geb981cc7d

Extra modules: Location (extra): /opt/opencv_contrib/modules Version control (extra): 4.0.0-beta-4-gfd63e177

Platform: Timestamp: 2018-10-26T08:48:21Z Host: Linux 4.15.0-36-generic x86_64 CMake: 3.10.2 CMake generator: Unix Makefiles CMake build tool: /usr/bin/make Configuration: RELEASE

CPU/HW features: Baseline: SSE SSE2 SSE3 requested: SSE3 disabled: AVX Dispatched code generation: SSE4_1 SSE4_2 FP16 AVX AVX2 AVX512_SKX requested: SSE4_1 SSE4_2 AVX FP16 AVX2 AVX512_SKX SSE4_1 (3 files): + SSSE3 SSE4_1 SSE4_2 (1 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 (0 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 AVX AVX (5 files): + SSSE3 SSE4_1 POPCNT SSE4_2 AVX AVX2 (9 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2 AVX512_SKX (1 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2 AVX_512F AVX512_SKX

C/C++: Built as dynamic libs?: YES C++ Compiler: /usr/bin/c++ (ver 7.3.0) C++ flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG C++ flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D_DEBUG C Compiler: /usr/bin/cc C flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-narrowing -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -O3 -DNDEBUG -DNDEBUG C flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-narrowing -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -g -O0 -DDEBUG -D_DEBUG Linker flags (Release):
Linker flags (Debug):
ccache: NO Precompiled headers: YES Extra dependencies: dl m pthread rt 3rdparty dependencies:

OpenCV modules: To be built: aruco bgsegm bioinspired calib3d ccalib core datasets dnn dnn_objdetect dpm face features2d flann freetype fuzzy gapi hfs highgui img_hash imgcodecs imgproc java_bindings_generator line_descriptor ml objdetect optflow phase_unwrapping photo plot python2 python3 python_bindings_generator reg rgbd saliency shape stereo stitching structured_light superres surface_matching text tracking video videoio videostab xfeatures2d ximgproc xobjdetect xphoto Disabled: world Disabled by dependency: - Unavailable: cnn_3dobj cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev cvv hdf java js matlab ovis sfm ts viz Applications: apps Documentation: NO Non-free algorithms: NO

GUI: GTK+: YES (ver 2.24.32) GThread : YES (ver 2.56.2) GtkGlExt: NO

Media I/O: ZLib: /usr/lib/x86_64-linux-gnu/libz.so (ver 1.2.11) JPEG: /usr/lib/x86_64-linux-gnu/libjpeg.so (ver 80) WEBP: build (ver encoder: 0x020e) PNG: /usr/lib/x86_64-linux-gnu/libpng.so (ver 1.6.34) TIFF: build (ver 42 - 4.0.9) JPEG 2000: build (ver 1.900.1) OpenEXR: build (ver 1.7.1) HDR: YES SUNRASTER: YES PXM: YES PFM: YES

Video I/O: DC1394: NO FFMPEG: YES avcodec: YES (ver 57.107.100) avformat: YES (ver 57.83.100) avutil: YES (ver 55.78.100) swscale: YES (ver 4.8.100) avresample: NO GStreamer: NO

Parallel framework: TBB (ver 2018.0 interface 10001)

Trace: YES (with Intel ITT)

Other third-party libraries: Lapack: NO Custom HAL: NO Protobuf: build (3.5.1)

Python 2: Interpreter: /usr/bin/python2.7 (ver 2.7.15) Libraries: /usr/lib/x86_64-linux-gnu/libpython2.7.so (ver 2.7.15rc1) numpy: /home/kico/.local/lib/python2.7/site-packages/numpy/core/include (ver 1.15.2) packages path: lib/python2.7/dist-packages

Python 3: Interpreter: /usr/bin/python3 (ver 3.6.6) Libraries: /usr/lib/x86_64-linux-gnu/libpython3.6m.so (ver 3.6.6) numpy: /home/kico/.local/lib/python3.6/site-packages/numpy/core/include (ver 1.15.2) packages path: lib/python3.6/dist-packages

Python (for build): /usr/bin/python2.7

Java:
ant: NO JNI: NO Java wrappers: NO Java tests: NO Install to: /usr/local

My problem is that the camera is not recognized.

I have tested Kamara with Chese and the program runs with videos. I have already googled and found nothing that fits

Sorry for my bad English

#include <opencv2/opencv.hpp>
#include <opencv2/tracking.hpp>
#include <opencv2/core/ocl.hpp>
#include <opencv2/tracking/tracker.hpp>
#include <opencv2/tracking/tldDataset.hpp>
#include <iostream>
#include <stdio.h>
using namespace cv;
using namespace std;

// Convert to string
#define SSTR( x ) static_cast< std::ostringstream & >( \
( std::ostringstream() << std::dec << x ) ).str()

int main(int argc, char **argv)
{ // List of tracker types in OpenCV 3.4.1
string trackerTypes[8] = {"BOOSTING", "MIL", "KCF", "TLD","MEDIANFLOW", "GOTURN", "MOSSE", "CSRT"};
// vector <string> trackerTypes(types, std::end(types));

// Create a tracker
string trackerType = trackerTypes[2];

Ptr<Tracker> tracker;

if (CV_MINOR_VERSION < 3)
{
    tracker = TrackerMIL::create();//        tracker = Tracker::create(trackerType);

}
else
{
    if (trackerType == "BOOSTING")
        tracker = TrackerBoosting::create();
    if (trackerType == "MIL")
        tracker = TrackerMIL::create();
    if (trackerType == "KCF")
        tracker = TrackerKCF::create();
    if (trackerType == "TLD")
        tracker = TrackerTLD::create();
    if (trackerType == "MEDIANFLOW")
        tracker = TrackerMedianFlow::create();
    if (trackerType == "GOTURN")
        tracker = TrackerGOTURN::create();
    if (trackerType == "MOSSE")
        tracker = TrackerMOSSE::create();
    if (trackerType == "CSRT")
        tracker = TrackerCSRT::create();
}


// Read video
VideoCapture video ;
video.open(-1);//video.open( "/dev/video0");

    cout << "OpenCV version : " << getBuildInformation()  << endl;
// Exit if video is not opened
if(!video.isOpened())
{
    cout << "Could not read video file" << endl; 
cout << "OpenCV version : " << CV_VERSION << endl;
    cout << "Major version : " << CV_MAJOR_VERSION << endl;
    cout << "Minor version : " << CV_MINOR_VERSION << endl;
    cout << "Subminor version : " << CV_SUBMINOR_VERSION << endl;
    return 1; 
} 

// Read first frame 
Mat frame; 
bool ok = video.read(frame); 

// Define initial bounding box 
Rect2d bbox(287, 23, 86, 320); 

// Uncomment the line below to select a different bounding box 
// bbox = selectROI(frame, false); 
// Display bounding box. 
rectangle(frame, bbox, Scalar( 255, 0, 0 ), 2, 1 ); 

imshow("Tracking", frame); 
tracker->init(frame, bbox);

while(video.read(frame))
{     
    // Start timer
    double timer = (double)getTickCount();

    // Update the tracking result
    bool ok = tracker->update(frame, bbox);

    // Calculate Frames per second (FPS)
    float fps = getTickFrequency() / ((double)getTickCount() - timer);

    if (ok)
    {
        // Tracking success : Draw the tracked object
        rectangle(frame, bbox, Scalar( 255, 0, 0 ), 2, 1 );
    }
    else
    {
        // Tracking failure detected.
        putText(frame, "Tracking failure detected", Point(100,80), FONT_HERSHEY_SIMPLEX, 0.75, Scalar(0,0,255),2);
    }

    // Display tracker type on frame
    putText(frame, trackerType + " Tracker", Point(100,20), FONT_HERSHEY_SIMPLEX, 0.75, Scalar(50,170,50),2);

    // Display FPS on frame
    putText(frame, "FPS : " + SSTR(int(fps)), Point(100,50), FONT_HERSHEY_SIMPLEX, 0.75, Scalar(50,170,50), 2);

    // Display frame.
    imshow("Tracking", frame);

    // Exit if ESC pressed.
    int k = waitKey(1);
    if(k == 27)
    {
        break;
    }

}
video.release();
destroyAllWindows();
}

OpenCV version : General configuration for OpenCV 4.0.0-pre ===================================== Version control: 4.0.0-beta-41-geb981cc7d

4.0.0-beta-41-geb981cc7d Extra modules: Location (extra): /opt/opencv_contrib/modules Version control (extra): 4.0.0-beta-4-gfd63e177

4.0.0-beta-4-gfd63e177 Platform: Timestamp: 2018-10-26T08:48:21Z Host: Linux 4.15.0-36-generic x86_64 CMake: 3.10.2 CMake generator: Unix Makefiles CMake build tool: /usr/bin/make Configuration: RELEASE

RELEASE CPU/HW features: Baseline: SSE SSE2 SSE3 requested: SSE3 disabled: AVX Dispatched code generation: SSE4_1 SSE4_2 FP16 AVX AVX2 AVX512_SKX requested: SSE4_1 SSE4_2 AVX FP16 AVX2 AVX512_SKX SSE4_1 (3 files): + SSSE3 SSE4_1 SSE4_2 (1 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 (0 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 AVX AVX (5 files): + SSSE3 SSE4_1 POPCNT SSE4_2 AVX AVX2 (9 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2 AVX512_SKX (1 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2 AVX_512F AVX512_SKX

AVX512_SKX C/C++: Built as dynamic libs?: YES C++ Compiler: /usr/bin/c++ (ver 7.3.0) C++ flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG C++ flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D_DEBUG C Compiler: /usr/bin/cc C flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-narrowing -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -O3 -DNDEBUG -DNDEBUG C flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-narrowing -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -g -O0 -DDEBUG -D_DEBUG Linker flags (Release):
Linker flags (Debug):
ccache: NO Precompiled headers: YES Extra dependencies: dl m pthread rt 3rdparty dependencies:

dependencies: OpenCV modules: To be built: aruco bgsegm bioinspired calib3d ccalib core datasets dnn dnn_objdetect dpm face features2d flann freetype fuzzy gapi hfs highgui img_hash imgcodecs imgproc java_bindings_generator line_descriptor ml objdetect optflow phase_unwrapping photo plot python2 python3 python_bindings_generator reg rgbd saliency shape stereo stitching structured_light superres surface_matching text tracking video videoio videostab xfeatures2d ximgproc xobjdetect xphoto Disabled: world Disabled by dependency: - Unavailable: cnn_3dobj cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev cvv hdf java js matlab ovis sfm ts viz Applications: apps Documentation: NO Non-free algorithms: NO

NO GUI: GTK+: YES (ver 2.24.32) GThread : YES (ver 2.56.2) GtkGlExt: NO

NO Media I/O: ZLib: /usr/lib/x86_64-linux-gnu/libz.so (ver 1.2.11) JPEG: /usr/lib/x86_64-linux-gnu/libjpeg.so (ver 80) WEBP: build (ver encoder: 0x020e) PNG: /usr/lib/x86_64-linux-gnu/libpng.so (ver 1.6.34) TIFF: build (ver 42 - 4.0.9) JPEG 2000: build (ver 1.900.1) OpenEXR: build (ver 1.7.1) HDR: YES SUNRASTER: YES PXM: YES PFM: YES

YES Video I/O: DC1394: NO FFMPEG: YES avcodec: YES (ver 57.107.100) avformat: YES (ver 57.83.100) avutil: YES (ver 55.78.100) swscale: YES (ver 4.8.100) avresample: NO GStreamer: NO

NO Parallel framework: TBB (ver 2018.0 interface 10001)

10001) Trace: YES (with Intel ITT)

ITT) Other third-party libraries: Lapack: NO Custom HAL: NO Protobuf: build (3.5.1)

(3.5.1) Python 2: Interpreter: /usr/bin/python2.7 (ver 2.7.15) Libraries: /usr/lib/x86_64-linux-gnu/libpython2.7.so (ver 2.7.15rc1) numpy: /home/kico/.local/lib/python2.7/site-packages/numpy/core/include (ver 1.15.2) packages path: lib/python2.7/dist-packages

lib/python2.7/dist-packages Python 3: Interpreter: /usr/bin/python3 (ver 3.6.6) Libraries: /usr/lib/x86_64-linux-gnu/libpython3.6m.so (ver 3.6.6) numpy: /home/kico/.local/lib/python3.6/site-packages/numpy/core/include (ver 1.15.2) packages path: lib/python3.6/dist-packages

lib/python3.6/dist-packages Python (for build): /usr/bin/python2.7

/usr/bin/python2.7 Java:
ant: NO JNI: NO Java wrappers: NO Java tests: NO Install to: /usr/local

My problem is that the camera is not recognized.

I have tested Kamara with Chese and the program runs with videos. I have already googled and found nothing that fits

Sorry for my bad English

#include <opencv2/opencv.hpp>
#include <opencv2/tracking.hpp>
#include <opencv2/core/ocl.hpp>
#include <opencv2/tracking/tracker.hpp>
#include <opencv2/tracking/tldDataset.hpp>
#include <iostream>
#include <stdio.h>
using namespace cv;
using namespace std;

// Convert to string
#define SSTR( x ) static_cast< std::ostringstream & >( \
( std::ostringstream() << std::dec << x ) ).str()

int main(int argc, char **argv)
{ // List of tracker types in OpenCV 3.4.1
string trackerTypes[8] = {"BOOSTING", "MIL", "KCF", "TLD","MEDIANFLOW", "GOTURN", "MOSSE", "CSRT"};
// vector <string> trackerTypes(types, std::end(types));

// Create a tracker
string trackerType = trackerTypes[2];

Ptr<Tracker> tracker;

if (CV_MINOR_VERSION < 3)
{
    tracker = TrackerMIL::create();//        tracker = Tracker::create(trackerType);

}
else
{
    if (trackerType == "BOOSTING")
        tracker = TrackerBoosting::create();
    if (trackerType == "MIL")
        tracker = TrackerMIL::create();
    if (trackerType == "KCF")
        tracker = TrackerKCF::create();
    if (trackerType == "TLD")
        tracker = TrackerTLD::create();
    if (trackerType == "MEDIANFLOW")
        tracker = TrackerMedianFlow::create();
    if (trackerType == "GOTURN")
        tracker = TrackerGOTURN::create();
    if (trackerType == "MOSSE")
        tracker = TrackerMOSSE::create();
    if (trackerType == "CSRT")
        tracker = TrackerCSRT::create();
}


// Read video
VideoCapture video ;
video.open(-1);//video.open( "/dev/video0");

    cout << "OpenCV version : " << getBuildInformation()  << endl;
// Exit if video is not opened
if(!video.isOpened())
{
    cout << "Could not read video file" << endl; 
cout << "OpenCV version : " << CV_VERSION << endl;
    cout << "Major version : " << CV_MAJOR_VERSION << endl;
    cout << "Minor version : " << CV_MINOR_VERSION << endl;
    cout << "Subminor version : " << CV_SUBMINOR_VERSION << endl;
    return 1; 
} 

// Read first frame 
Mat frame; 
bool ok = video.read(frame); 

// Define initial bounding box 
Rect2d bbox(287, 23, 86, 320); 

// Uncomment the line below to select a different bounding box 
// bbox = selectROI(frame, false); 
// Display bounding box. 
rectangle(frame, bbox, Scalar( 255, 0, 0 ), 2, 1 ); 

imshow("Tracking", frame); 
tracker->init(frame, bbox);

while(video.read(frame))
{     
    // Start timer
    double timer = (double)getTickCount();

    // Update the tracking result
    bool ok = tracker->update(frame, bbox);

    // Calculate Frames per second (FPS)
    float fps = getTickFrequency() / ((double)getTickCount() - timer);

    if (ok)
    {
        // Tracking success : Draw the tracked object
        rectangle(frame, bbox, Scalar( 255, 0, 0 ), 2, 1 );
    }
    else
    {
        // Tracking failure detected.
        putText(frame, "Tracking failure detected", Point(100,80), FONT_HERSHEY_SIMPLEX, 0.75, Scalar(0,0,255),2);
    }

    // Display tracker type on frame
    putText(frame, trackerType + " Tracker", Point(100,20), FONT_HERSHEY_SIMPLEX, 0.75, Scalar(50,170,50),2);

    // Display FPS on frame
    putText(frame, "FPS : " + SSTR(int(fps)), Point(100,50), FONT_HERSHEY_SIMPLEX, 0.75, Scalar(50,170,50), 2);

    // Display frame.
    imshow("Tracking", frame);

    // Exit if ESC pressed.
    int k = waitKey(1);
    if(k == 27)
    {
        break;
    }

}
video.release();
destroyAllWindows();
}

OpenCV version : 
General configuration for OpenCV 4.0.0-pre =====================================
  Version control:               4.0.0-beta-41-geb981cc7d

  Extra modules:
    Location (extra):            /opt/opencv_contrib/modules
    Version control (extra):     4.0.0-beta-4-gfd63e177

  Platform:
    Timestamp:                   2018-10-26T08:48:21Z
    Host:                        Linux 4.15.0-36-generic x86_64
    CMake:                       3.10.2
    CMake generator:             Unix Makefiles
    CMake build tool:            /usr/bin/make
    Configuration:               RELEASE

  CPU/HW features:
    Baseline:                    SSE SSE2 SSE3
      requested:                 SSE3
      disabled:                  AVX
    Dispatched code generation:  SSE4_1 SSE4_2 FP16 AVX AVX2 AVX512_SKX
      requested:                 SSE4_1 SSE4_2 AVX FP16 AVX2 AVX512_SKX
      SSE4_1 (3 files):          + SSSE3 SSE4_1
      SSE4_2 (1 files):          + SSSE3 SSE4_1 POPCNT SSE4_2
      FP16 (0 files):            + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 AVX
      AVX (5 files):             + SSSE3 SSE4_1 POPCNT SSE4_2 AVX
      AVX2 (9 files):            + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2
      AVX512_SKX (1 files):      + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2 AVX_512F AVX512_SKX

  C/C++:
    Built as dynamic libs?:      YES
    C++ Compiler:                /usr/bin/c++  (ver 7.3.0)
    C++ flags (Release):         -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG  -DNDEBUG
    C++ flags (Debug):           -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -g  -O0 -DDEBUG -D_DEBUG
    C Compiler:                  /usr/bin/cc
    C flags (Release):           -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-narrowing -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -O3 -DNDEBUG  -DNDEBUG
    C flags (Debug):             -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-narrowing -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -g  -O0 -DDEBUG -D_DEBUG
    Linker flags (Release):      
    Linker flags (Debug):        
    ccache:                      NO
    Precompiled headers:         YES
    Extra dependencies:          dl m pthread rt
    3rdparty dependencies:

  OpenCV modules:
    To be built:                 aruco bgsegm bioinspired calib3d ccalib core datasets dnn dnn_objdetect dpm face features2d flann freetype fuzzy gapi hfs highgui img_hash imgcodecs imgproc java_bindings_generator line_descriptor ml objdetect optflow phase_unwrapping photo plot python2 python3 python_bindings_generator reg rgbd saliency shape stereo stitching structured_light superres surface_matching text tracking video videoio videostab xfeatures2d ximgproc xobjdetect xphoto
    Disabled:                    world
    Disabled by dependency:      -
    Unavailable:                 cnn_3dobj cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev cvv hdf java js matlab ovis sfm ts viz
    Applications:                apps
    Documentation:               NO
    Non-free algorithms:         NO

  GUI: 
    GTK+:                        YES (ver 2.24.32)
      GThread :                  YES (ver 2.56.2)
      GtkGlExt:                  NO

  Media I/O: 
    ZLib:                        /usr/lib/x86_64-linux-gnu/libz.so (ver 1.2.11)
    JPEG:                        /usr/lib/x86_64-linux-gnu/libjpeg.so (ver 80)
    WEBP:                        build (ver encoder: 0x020e)
    PNG:                         /usr/lib/x86_64-linux-gnu/libpng.so (ver 1.6.34)
    TIFF:                        build (ver 42 - 4.0.9)
    JPEG 2000:                   build (ver 1.900.1)
    OpenEXR:                     build (ver 1.7.1)
    HDR:                         YES
    SUNRASTER:                   YES
    PXM:                         YES
    PFM:                         YES

  Video I/O:
    DC1394:                      NO
    FFMPEG:                      YES
      avcodec:                   YES (ver 57.107.100)
      avformat:                  YES (ver 57.83.100)
      avutil:                    YES (ver 55.78.100)
      swscale:                   YES (ver 4.8.100)
      avresample:                NO
    GStreamer:                   NO

  Parallel framework:            TBB (ver 2018.0 interface 10001)

  Trace:                         YES (with Intel ITT)

  Other third-party libraries:
    Lapack:                      NO
    Custom HAL:                  NO
    Protobuf:                    build (3.5.1)

  Python 2:
    Interpreter:                 /usr/bin/python2.7 (ver 2.7.15)
    Libraries:                   /usr/lib/x86_64-linux-gnu/libpython2.7.so (ver 2.7.15rc1)
    numpy:                       /home/kico/.local/lib/python2.7/site-packages/numpy/core/include (ver 1.15.2)
    packages path:               lib/python2.7/dist-packages

  Python 3:
    Interpreter:                 /usr/bin/python3 (ver 3.6.6)
    Libraries:                   /usr/lib/x86_64-linux-gnu/libpython3.6m.so (ver 3.6.6)
    numpy:                       /home/kico/.local/lib/python3.6/site-packages/numpy/core/include (ver 1.15.2)
    packages path:               lib/python3.6/dist-packages

  Python (for build):            /usr/bin/python2.7

  Java:                          
    ant:                         NO
    JNI:                         NO
    Java wrappers:               NO
    Java tests:                  NO
Install to:                    /usr/local

My problem is that the camera is not recognized.

I have tested Kamara with Chese and the program runs with videos. I have already googled and found nothing that fits

Sorry for my bad English

#include <opencv2/opencv.hpp>
#include <opencv2/tracking.hpp>
#include <opencv2/core/ocl.hpp>
#include <opencv2/tracking/tracker.hpp>
#include <opencv2/tracking/tldDataset.hpp>
#include <iostream>
#include <stdio.h>
using namespace cv;
using namespace std;

// Convert to string
#define SSTR( x ) static_cast< std::ostringstream & >( \
( std::ostringstream() << std::dec << x ) ).str()

int main(int argc, char **argv)
{ // List of tracker types in OpenCV 3.4.1
string trackerTypes[8] = {"BOOSTING", "MIL", "KCF", "TLD","MEDIANFLOW", "GOTURN", "MOSSE", "CSRT"};
// vector <string> trackerTypes(types, std::end(types));

// Create a tracker
string trackerType = trackerTypes[2];

Ptr<Tracker> tracker;

if (CV_MINOR_VERSION < 3)
{
    tracker = TrackerMIL::create();//        tracker = Tracker::create(trackerType);

}
else
{
    if (trackerType == "BOOSTING")
        tracker = TrackerBoosting::create();
    if (trackerType == "MIL")
        tracker = TrackerMIL::create();
    if (trackerType == "KCF")
        tracker = TrackerKCF::create();
    if (trackerType == "TLD")
        tracker = TrackerTLD::create();
    if (trackerType == "MEDIANFLOW")
        tracker = TrackerMedianFlow::create();
    if (trackerType == "GOTURN")
        tracker = TrackerGOTURN::create();
    if (trackerType == "MOSSE")
        tracker = TrackerMOSSE::create();
    if (trackerType == "CSRT")
        tracker = TrackerCSRT::create();
}


// Read video
VideoCapture video ;
video.open(-1);//video.open( "/dev/video0");

    cout << "OpenCV version : " << getBuildInformation()  << endl;
// Exit if video is not opened
if(!video.isOpened())
{
    cout << "Could not read video file" << endl; 
cout << "OpenCV version : " << CV_VERSION << endl;
    cout << "Major version : " << CV_MAJOR_VERSION << endl;
    cout << "Minor version : " << CV_MINOR_VERSION << endl;
    cout << "Subminor version : " << CV_SUBMINOR_VERSION << endl;
    return 1; 
} 

// Read first frame 
Mat frame; 
bool ok = video.read(frame); 

// Define initial bounding box 
Rect2d bbox(287, 23, 86, 320); 

// Uncomment the line below to select a different bounding box 
// bbox = selectROI(frame, false); 
// Display bounding box. 
rectangle(frame, bbox, Scalar( 255, 0, 0 ), 2, 1 ); 

imshow("Tracking", frame); 
tracker->init(frame, bbox);

while(video.read(frame))
{     
    // Start timer
    double timer = (double)getTickCount();

    // Update the tracking result
    bool ok = tracker->update(frame, bbox);

    // Calculate Frames per second (FPS)
    float fps = getTickFrequency() / ((double)getTickCount() - timer);

    if (ok)
    {
        // Tracking success : Draw the tracked object
        rectangle(frame, bbox, Scalar( 255, 0, 0 ), 2, 1 );
    }
    else
    {
        // Tracking failure detected.
        putText(frame, "Tracking failure detected", Point(100,80), FONT_HERSHEY_SIMPLEX, 0.75, Scalar(0,0,255),2);
    }

    // Display tracker type on frame
    putText(frame, trackerType + " Tracker", Point(100,20), FONT_HERSHEY_SIMPLEX, 0.75, Scalar(50,170,50),2);

    // Display FPS on frame
    putText(frame, "FPS : " + SSTR(int(fps)), Point(100,50), FONT_HERSHEY_SIMPLEX, 0.75, Scalar(50,170,50), 2);

    // Display frame.
    imshow("Tracking", frame);

    // Exit if ESC pressed.
    int k = waitKey(1);
    if(k == 27)
    {
        break;
    }

}
video.release();
destroyAllWindows();
}

OpenCV version : 
General configuration for OpenCV 4.0.0-pre =====================================
  Version control:               4.0.0-beta-41-geb981cc7d

  Extra modules:
    Location (extra):            /opt/opencv_contrib/modules
    Version control (extra):     4.0.0-beta-4-gfd63e177

  Platform:
    Timestamp:                   2018-10-26T08:48:21Z
    Host:                        Linux 4.15.0-36-generic x86_64
    CMake:                       3.10.2
    CMake generator:             Unix Makefiles
    CMake build tool:            /usr/bin/make
    Configuration:               RELEASE

  CPU/HW features:
    Baseline:                    SSE SSE2 SSE3
      requested:                 SSE3
      disabled:                  AVX
    Dispatched code generation:  SSE4_1 SSE4_2 FP16 AVX AVX2 AVX512_SKX
      requested:                 SSE4_1 SSE4_2 AVX FP16 AVX2 AVX512_SKX
      SSE4_1 (3 files):          + SSSE3 SSE4_1
      SSE4_2 (1 files):          + SSSE3 SSE4_1 POPCNT SSE4_2
      FP16 (0 files):            + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 AVX
      AVX (5 files):             + SSSE3 SSE4_1 POPCNT SSE4_2 AVX
      AVX2 (9 files):            + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2
      AVX512_SKX (1 files):      + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2 AVX_512F AVX512_SKX

  C/C++:
    Built as dynamic libs?:      YES
    C++ Compiler:                /usr/bin/c++  (ver 7.3.0)
    C++ flags (Release):         -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG  -DNDEBUG
    C++ flags (Debug):           -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -g  -O0 -DDEBUG -D_DEBUG
    C Compiler:                  /usr/bin/cc
    C flags (Release):           -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-narrowing -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -O3 -DNDEBUG  -DNDEBUG
    C flags (Debug):             -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-narrowing -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -g  -O0 -DDEBUG -D_DEBUG
    Linker flags (Release):      
    Linker flags (Debug):        
    ccache:                      NO
    Precompiled headers:         YES
    Extra dependencies:          dl m pthread rt
    3rdparty dependencies:

  OpenCV modules:
    To be built:                 aruco bgsegm bioinspired calib3d ccalib core datasets dnn dnn_objdetect dpm face features2d flann freetype fuzzy gapi hfs highgui img_hash imgcodecs imgproc java_bindings_generator line_descriptor ml objdetect optflow phase_unwrapping photo plot python2 python3 python_bindings_generator reg rgbd saliency shape stereo stitching structured_light superres surface_matching text tracking video videoio videostab xfeatures2d ximgproc xobjdetect xphoto
    Disabled:                    world
    Disabled by dependency:      -
    Unavailable:                 cnn_3dobj cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev cvv hdf java js matlab ovis sfm ts viz
    Applications:                apps
    Documentation:               NO
    Non-free algorithms:         NO

  GUI: 
    GTK+:                        YES (ver 2.24.32)
      GThread :                  YES (ver 2.56.2)
      GtkGlExt:                  NO

  Media I/O: 
    ZLib:                        /usr/lib/x86_64-linux-gnu/libz.so (ver 1.2.11)
    JPEG:                        /usr/lib/x86_64-linux-gnu/libjpeg.so (ver 80)
    WEBP:                        build (ver encoder: 0x020e)
    PNG:                         /usr/lib/x86_64-linux-gnu/libpng.so (ver 1.6.34)
    TIFF:                        build (ver 42 - 4.0.9)
    JPEG 2000:                   build (ver 1.900.1)
    OpenEXR:                     build (ver 1.7.1)
    HDR:                         YES
    SUNRASTER:                   YES
    PXM:                         YES
    PFM:                         YES

  Video I/O:
    DC1394:                      NO
    FFMPEG:                      YES
      avcodec:                   YES (ver 57.107.100)
      avformat:                  YES (ver 57.83.100)
      avutil:                    YES (ver 55.78.100)
      swscale:                   YES (ver 4.8.100)
      avresample:                NO
    GStreamer:                   NO

  Parallel framework:            TBB (ver 2018.0 interface 10001)

  Trace:                         YES (with Intel ITT)

  Other third-party libraries:
    Lapack:                      NO
    Custom HAL:                  NO
    Protobuf:                    build (3.5.1)

  Python 2:
    Interpreter:                 /usr/bin/python2.7 (ver 2.7.15)
    Libraries:                   /usr/lib/x86_64-linux-gnu/libpython2.7.so (ver 2.7.15rc1)
    numpy:                       /home/kico/.local/lib/python2.7/site-packages/numpy/core/include (ver 1.15.2)
    packages path:               lib/python2.7/dist-packages

  Python 3:
    Interpreter:                 /usr/bin/python3 (ver 3.6.6)
    Libraries:                   /usr/lib/x86_64-linux-gnu/libpython3.6m.so (ver 3.6.6)
    numpy:                       /home/kico/.local/lib/python3.6/site-packages/numpy/core/include (ver 1.15.2)
    packages path:               lib/python3.6/dist-packages

  Python (for build):            /usr/bin/python2.7

  Java:                          
    ant:                         NO
    JNI:                         NO
    Java wrappers:               NO
    Java tests:                  NO
Install to:                    /usr/local

I get this error without catch terminate called after throwing an instance of 'cv::Exception' what(): OpenCV(4.0.0-pre) /opt/opencv/modules/highgui/src/window.cpp:356: error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'imshow'

I found that with OPENCV_VIDEOIO_DEBUG = 1

[ INFO:0] VIDEOIO: Enabled backends(3, sorted by priority): FFMPEG(1000); CV_IMAGES(990); CV_MJPEG(980)

My problem is that the camera is not recognized.

I have tested Kamara with Chese and the program runs with videos. I have already googled and found nothing that fits

Sorry for my bad English

#include <opencv2/opencv.hpp>
#include <opencv2/tracking.hpp>
#include <opencv2/core/ocl.hpp>
#include <opencv2/tracking/tracker.hpp>
#include <opencv2/tracking/tldDataset.hpp>
#include <iostream>
#include <stdio.h>
using namespace cv;
using namespace std;

// Convert to string
#define SSTR( x ) static_cast< std::ostringstream & >( \
( std::ostringstream() << std::dec << x ) ).str()

int main(int argc, char **argv)
{ // List of tracker types in OpenCV 3.4.1
string trackerTypes[8] = {"BOOSTING", "MIL", "KCF", "TLD","MEDIANFLOW", "GOTURN", "MOSSE", "CSRT"};
// vector <string> trackerTypes(types, std::end(types));

// Create a tracker
string trackerType = trackerTypes[2];

Ptr<Tracker> tracker;

if (CV_MINOR_VERSION < 3)
{
    tracker = TrackerMIL::create();//        tracker = Tracker::create(trackerType);

}
else
{
    if (trackerType == "BOOSTING")
        tracker = TrackerBoosting::create();
    if (trackerType == "MIL")
        tracker = TrackerMIL::create();
    if (trackerType == "KCF")
        tracker = TrackerKCF::create();
    if (trackerType == "TLD")
        tracker = TrackerTLD::create();
    if (trackerType == "MEDIANFLOW")
        tracker = TrackerMedianFlow::create();
    if (trackerType == "GOTURN")
        tracker = TrackerGOTURN::create();
    if (trackerType == "MOSSE")
        tracker = TrackerMOSSE::create();
    if (trackerType == "CSRT")
        tracker = TrackerCSRT::create();
}


// Read video
VideoCapture video ;
video.open(-1);//video.open( "/dev/video0");

    cout << "OpenCV version : " << getBuildInformation()  << endl;
// Exit if video is not opened
if(!video.isOpened())
{
    cout << "Could not read video file" << endl; 
cout << "OpenCV version : " << CV_VERSION << endl;
    cout << "Major version : " << CV_MAJOR_VERSION << endl;
    cout << "Minor version : " << CV_MINOR_VERSION << endl;
    cout << "Subminor version : " << CV_SUBMINOR_VERSION << endl;
    return 1; 
} 

// Read first frame 
Mat frame; 
bool ok = video.read(frame); 

// Define initial bounding box 
Rect2d bbox(287, 23, 86, 320); 

// Uncomment the line below to select a different bounding box 
// bbox = selectROI(frame, false); 
// Display bounding box. 
rectangle(frame, bbox, Scalar( 255, 0, 0 ), 2, 1 ); 

imshow("Tracking", frame); 
tracker->init(frame, bbox);

while(video.read(frame))
{     
    // Start timer
    double timer = (double)getTickCount();

    // Update the tracking result
    bool ok = tracker->update(frame, bbox);

    // Calculate Frames per second (FPS)
    float fps = getTickFrequency() / ((double)getTickCount() - timer);

    if (ok)
    {
        // Tracking success : Draw the tracked object
        rectangle(frame, bbox, Scalar( 255, 0, 0 ), 2, 1 );
    }
    else
    {
        // Tracking failure detected.
        putText(frame, "Tracking failure detected", Point(100,80), FONT_HERSHEY_SIMPLEX, 0.75, Scalar(0,0,255),2);
    }

    // Display tracker type on frame
    putText(frame, trackerType + " Tracker", Point(100,20), FONT_HERSHEY_SIMPLEX, 0.75, Scalar(50,170,50),2);

    // Display FPS on frame
    putText(frame, "FPS : " + SSTR(int(fps)), Point(100,50), FONT_HERSHEY_SIMPLEX, 0.75, Scalar(50,170,50), 2);

    // Display frame.
    imshow("Tracking", frame);

    // Exit if ESC pressed.
    int k = waitKey(1);
    if(k == 27)
    {
        break;
    }

}
video.release();
destroyAllWindows();
}

OpenCV version : 
General configuration for OpenCV 4.0.0-pre =====================================
  Version control:               4.0.0-beta-41-geb981cc7d

  Extra modules:
    Location (extra):            /opt/opencv_contrib/modules
    Version control (extra):     4.0.0-beta-4-gfd63e177

  Platform:
    Timestamp:                   2018-10-26T08:48:21Z
    Host:                        Linux 4.15.0-36-generic x86_64
    CMake:                       3.10.2
    CMake generator:             Unix Makefiles
    CMake build tool:            /usr/bin/make
    Configuration:               RELEASE

  CPU/HW features:
    Baseline:                    SSE SSE2 SSE3
      requested:                 SSE3
      disabled:                  AVX
    Dispatched code generation:  SSE4_1 SSE4_2 FP16 AVX AVX2 AVX512_SKX
      requested:                 SSE4_1 SSE4_2 AVX FP16 AVX2 AVX512_SKX
      SSE4_1 (3 files):          + SSSE3 SSE4_1
      SSE4_2 (1 files):          + SSSE3 SSE4_1 POPCNT SSE4_2
      FP16 (0 files):            + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 AVX
      AVX (5 files):             + SSSE3 SSE4_1 POPCNT SSE4_2 AVX
      AVX2 (9 files):            + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2
      AVX512_SKX (1 files):      + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2 AVX_512F AVX512_SKX

  C/C++:
    Built as dynamic libs?:      YES
    C++ Compiler:                /usr/bin/c++  (ver 7.3.0)
    C++ flags (Release):         -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG  -DNDEBUG
    C++ flags (Debug):           -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -g  -O0 -DDEBUG -D_DEBUG
    C Compiler:                  /usr/bin/cc
    C flags (Release):           -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-narrowing -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -O3 -DNDEBUG  -DNDEBUG
    C flags (Debug):             -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-narrowing -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -g  -O0 -DDEBUG -D_DEBUG
    Linker flags (Release):      
    Linker flags (Debug):        
    ccache:                      NO
    Precompiled headers:         YES
    Extra dependencies:          dl m pthread rt
    3rdparty dependencies:

  OpenCV modules:
    To be built:                 aruco bgsegm bioinspired calib3d ccalib core datasets dnn dnn_objdetect dpm face features2d flann freetype fuzzy gapi hfs highgui img_hash imgcodecs imgproc java_bindings_generator line_descriptor ml objdetect optflow phase_unwrapping photo plot python2 python3 python_bindings_generator reg rgbd saliency shape stereo stitching structured_light superres surface_matching text tracking video videoio videostab xfeatures2d ximgproc xobjdetect xphoto
    Disabled:                    world
    Disabled by dependency:      -
    Unavailable:                 cnn_3dobj cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev cvv hdf java js matlab ovis sfm ts viz
    Applications:                apps
    Documentation:               NO
    Non-free algorithms:         NO

  GUI: 
    GTK+:                        YES (ver 2.24.32)
      GThread :                  YES (ver 2.56.2)
      GtkGlExt:                  NO

  Media I/O: 
    ZLib:                        /usr/lib/x86_64-linux-gnu/libz.so (ver 1.2.11)
    JPEG:                        /usr/lib/x86_64-linux-gnu/libjpeg.so (ver 80)
    WEBP:                        build (ver encoder: 0x020e)
    PNG:                         /usr/lib/x86_64-linux-gnu/libpng.so (ver 1.6.34)
    TIFF:                        build (ver 42 - 4.0.9)
    JPEG 2000:                   build (ver 1.900.1)
    OpenEXR:                     build (ver 1.7.1)
    HDR:                         YES
    SUNRASTER:                   YES
    PXM:                         YES
    PFM:                         YES

  Video I/O:
    DC1394:                      NO
    FFMPEG:                      YES
      avcodec:                   YES (ver 57.107.100)
      avformat:                  YES (ver 57.83.100)
      avutil:                    YES (ver 55.78.100)
      swscale:                   YES (ver 4.8.100)
      avresample:                NO
    GStreamer:                   NO

  Parallel framework:            TBB (ver 2018.0 interface 10001)

  Trace:                         YES (with Intel ITT)

  Other third-party libraries:
    Lapack:                      NO
    Custom HAL:                  NO
    Protobuf:                    build (3.5.1)

  Python 2:
    Interpreter:                 /usr/bin/python2.7 (ver 2.7.15)
    Libraries:                   /usr/lib/x86_64-linux-gnu/libpython2.7.so (ver 2.7.15rc1)
    numpy:                       /home/kico/.local/lib/python2.7/site-packages/numpy/core/include (ver 1.15.2)
    packages path:               lib/python2.7/dist-packages

  Python 3:
    Interpreter:                 /usr/bin/python3 (ver 3.6.6)
    Libraries:                   /usr/lib/x86_64-linux-gnu/libpython3.6m.so (ver 3.6.6)
    numpy:                       /home/kico/.local/lib/python3.6/site-packages/numpy/core/include (ver 1.15.2)
    packages path:               lib/python3.6/dist-packages

  Python (for build):            /usr/bin/python2.7

  Java:                          
    ant:                         NO
    JNI:                         NO
    Java wrappers:               NO
    Java tests:                  NO
Install to:                    /usr/local

I get this error without catch terminate called after throwing an instance of 'cv::Exception' what(): OpenCV(4.0.0-pre) /opt/opencv/modules/highgui/src/window.cpp:356: error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'imshow'

I found that with OPENCV_VIDEOIO_DEBUG = 1

[ INFO:0] VIDEOIO: Enabled backends(3, sorted by priority): FFMPEG(1000); CV_IMAGES(990); CV_MJPEG(980)

Gstream cmake cmake

-- Looking for ccache - not found
-- Found ZLIB: /usr/lib/x86_64-linux-gnu/libz.so (found suitable version "1.2.11", minimum required is "1.2.3") 
-- Found ZLIB: /usr/lib/x86_64-linux-gnu/libz.so (found version "1.2.11") 
-- Found OpenEXR: /usr/lib/x86_64-linux-gnu/libIlmImf.so
-- Checking for module 'gtk+-3.0'
--   No package 'gtk+-3.0' found
-- Looking for linux/videodev2.h
-- Looking for linux/videodev2.h - found
-- Looking for sys/videoio.h
-- Looking for sys/videoio.h - not found
-- found Intel IPP (ICV version): 2019.0.0 [2019.0.0 Gold]
-- at: /opt/opencv/build/3rdparty/ippicv/ippicv_lnx/icv
-- found Intel IPP Integration Wrappers sources: 2019.0.0
-- at: /opt/opencv/build/3rdparty/ippicv/ippicv_lnx/iw
-- Could not find OpenBLAS include. Turning OpenBLAS_FOUND off
-- Could not find OpenBLAS lib. Turning OpenBLAS_FOUND off
-- Could NOT find Atlas (missing: Atlas_CBLAS_INCLUDE_DIR Atlas_CLAPACK_INCLUDE_DIR Atlas_CBLAS_LIBRARY Atlas_BLAS_LIBRARY Atlas_LAPACK_LIBRARY) 
-- A library with BLAS API not found. Please specify library location.
-- LAPACK requires BLAS
-- A library with LAPACK API not found. Please specify library location.
-- Could NOT find JNI (missing: JAVA_AWT_LIBRARY JAVA_JVM_LIBRARY JAVA_INCLUDE_PATH JAVA_INCLUDE_PATH2 JAVA_AWT_INCLUDE_PATH) 
-- VTK is not found. Please set -DVTK_DIR in CMake to VTK build directory, or to VTK install subdirectory with VTKConfig.cmake file
-- Caffe:   NO
-- Protobuf:   NO
-- Glog:   NO
-- freetype2:   YES
-- harfbuzz:    YES
-- Could NOT find HDF5 (missing: HDF5_LIBRARIES HDF5_INCLUDE_DIRS) (found version "")
-- Module opencv_ovis disabled because OGRE3D was not found
-- No preference for use of exported gflags CMake configuration set, and no hints for include/library directories provided. Defaulting to preferring an installed/exported gflags CMake configuration if available.
-- Failed to find installed gflags CMake configuration, searching for gflags build directories exported with CMake.
-- Failed to find gflags - Failed to find an installed/exported CMake configuration for gflags, will perform search for installed gflags components.
-- Failed to find gflags - Could not find gflags include directory, set GFLAGS_INCLUDE_DIR to directory containing gflags/gflags.h
-- Failed to find glog - Could not find glog include directory, set GLOG_INCLUDE_DIR to directory containing glog/logging.h
-- Module opencv_sfm disabled because the following dependencies are not found: Glog/Gflags
-- freetype2:   YES
-- harfbuzz:    YES
-- Checking for modules 'tesseract;lept'
--   No package 'tesseract' found
--   No package 'lept' found
 
found
-- Tesseract:   NO
 
NO
-- 
-- General configuration for OpenCV 4.0.0-pre =====================================
 
=====================================
--   Version control:               4.0.0-rc-21-g8409aa9eb
 
4.0.0-rc-21-g8409aa9eb
-- 
--   Extra modules:
--     Location (extra):            /opt/opencv_contrib/modules
 
/opt/opencv_contrib/modules
--     Version control (extra):     4.0.0-rc
 
4.0.0-rc
-- 
--   Platform:
--     Timestamp:                   2018-11-15T11:33:58Z
--     Host:                        Linux 4.15.0-39-generic x86_64
--     CMake:                       3.10.2
--     CMake generator:             Unix Makefiles
--     CMake build tool:            /usr/bin/make
 
/usr/bin/make
--     Configuration:               Release
 
Release
-- 
--   CPU/HW features:
--     Baseline:                    SSE SSE2 SSE3
--       requested:                 SSE3
--     Dispatched code generation:  SSE4_1 SSE4_2 FP16 AVX AVX2 AVX512_SKX
--       requested:                 SSE4_1 SSE4_2 AVX FP16 AVX2 AVX512_SKX
--       SSE4_1 (7 files):          + SSSE3 SSE4_1
--       SSE4_2 (2 files):          + SSSE3 SSE4_1 POPCNT SSE4_2
--       FP16 (1 files):            + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 AVX
--       AVX (5 files):             + SSSE3 SSE4_1 POPCNT SSE4_2 AVX
--       AVX2 (13 files):           + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2
 
AVX2
--       AVX512_SKX (1 files):      + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2 AVX_512F AVX512_SKX
 
AVX512_SKX
-- 
--   C/C++:
--     Built as dynamic libs?:      YES
--     C++ Compiler:                /usr/bin/c++  (ver 7.3.0)
--     C++ flags (Release):         -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG  -DNDEBUG
--     C++ flags (Debug):           -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -g  -O0 -DDEBUG -D_DEBUG
--     C Compiler:                  /usr/bin/cc
--     C flags (Release):           -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-narrowing -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -O3 -DNDEBUG  -DNDEBUG
--     C flags (Debug):             -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-narrowing -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections  -msse -msse2 -msse3 -fvisibility=hidden -g  -O0 -DDEBUG -D_DEBUG
--     Linker flags (Release): 
 
--     Linker flags (Debug): 
 
--     ccache:                      NO
--     Precompiled headers:         YES
--     Extra dependencies:          dl m pthread rt
 
rt
--     3rdparty dependencies:
 
dependencies:
-- 
--   OpenCV modules:
--     To be built:                 aruco bgsegm bioinspired calib3d ccalib core datasets dnn dnn_objdetect dpm face features2d flann freetype fuzzy gapi hfs highgui img_hash imgcodecs imgproc java_bindings_generator line_descriptor ml objdetect optflow phase_unwrapping photo plot python2 python3 python_bindings_generator reg rgbd saliency shape stereo stitching structured_light superres surface_matching text tracking ts video videoio videostab xfeatures2d ximgproc xobjdetect xphoto
--     Disabled:                    world
--     Disabled by dependency:      -
--     Unavailable:                 cnn_3dobj cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev cvv hdf java js matlab ovis sfm viz
--     Applications:                tests perf_tests apps
--     Documentation:               NO
 
NO
--     Non-free algorithms:         NO
 
NO
-- 
--   GUI: 
--     GTK+:                        YES (ver 2.24.32)
--       GThread :                  YES (ver 2.56.3)
--       GtkGlExt:                  NO
 
NO
--     VTK support:                 NO
 
NO
-- 
--   Media I/O: 
--     ZLib:                        /usr/lib/x86_64-linux-gnu/libz.so (ver 1.2.11)
--     JPEG:                        /usr/lib/x86_64-linux-gnu/libjpeg.so (ver 80)
--     WEBP:                        build (ver encoder: 0x020e)
--     PNG:                         /usr/lib/x86_64-linux-gnu/libpng.so (ver 1.6.34)
--     TIFF:                        /usr/lib/x86_64-linux-gnu/libtiff.so (ver 42 / 4.0.9)
--     JPEG 2000:                   /usr/lib/x86_64-linux-gnu/libjasper.so (ver 1.900.1)
--     OpenEXR:                     /usr/lib/x86_64-linux-gnu/libImath.so /usr/lib/x86_64-linux-gnu/libIlmImf.so /usr/lib/x86_64-linux-gnu/libIex.so /usr/lib/x86_64-linux-gnu/libHalf.so /usr/lib/x86_64-linux-gnu/libIlmThread.so (ver 2.2.0)
--     HDR:                         YES
--     SUNRASTER:                   YES
--     PXM:                         YES
 
YES
--     PFM:                         YES
 
YES
-- 
--   Video I/O:
--     DC1394:                      YES (ver 2.2.5)
--     FFMPEG:                      YES
--       avcodec:                   YES (ver 57.107.100)
--       avformat:                  YES (ver 57.83.100)
--       avutil:                    YES (ver 55.78.100)
--       swscale:                   YES (ver 4.8.100)
--       avresample:                YES (ver 3.7.0)
--     GStreamer: 
 
--       base:                      YES (ver 1.14.1)
--       video:                     YES (ver 1.14.1)
--       app:                       YES (ver 1.14.1)
--       riff:                      YES (ver 1.14.1)
--       pbutils:                   YES (ver 1.14.1)
 
1.14.1)
--     v4l/v4l2:                    linux/videodev2.h
 
linux/videodev2.h
-- 
--   Parallel framework:            pthreads
 
pthreads
-- 
--   Trace:                         YES (with Intel ITT)
 
ITT)
-- 
--   Other third-party libraries:
--     Intel IPP:                   2019.0.0 Gold [2019.0.0]
--            at:                   /opt/opencv/build/3rdparty/ippicv/ippicv_lnx/icv
--     Intel IPP IW:                sources (2019.0.0)
--               at:                /opt/opencv/build/3rdparty/ippicv/ippicv_lnx/iw
--     Lapack:                      NO
--     Eigen:                       YES (ver 3.3.4)
--     Custom HAL:                  NO
 
NO
--     Protobuf:                    build (3.5.1)
 
(3.5.1)
-- 
--   OpenCL:                        YES (no extra features)
--     Include path:                /opt/opencv/3rdparty/include/opencl/1.2
 
/opt/opencv/3rdparty/include/opencl/1.2
--     Link libraries:              Dynamic load
 
load
-- 
--   Python 2:
--     Interpreter:                 /usr/bin/python2.7 (ver 2.7.15)
--     Libraries:                   /usr/lib/x86_64-linux-gnu/libpython2.7.so (ver 2.7.15rc1)
--     numpy:                       /home/kico/.local/lib/python2.7/site-packages/numpy/core/include (ver 1.15.2)
 
1.15.2)
--     packages path:               lib/python2.7/dist-packages
 
lib/python2.7/dist-packages
-- 
--   Python 3:
--     Interpreter:                 /usr/bin/python3 (ver 3.6.6)
--     Libraries:                   /usr/lib/x86_64-linux-gnu/libpython3.6m.so (ver 3.6.6)
--     numpy:                       /home/kico/.local/lib/python3.6/site-packages/numpy/core/include (ver 1.15.4)
 
1.15.4)
--     packages path:               lib/python3.6/dist-packages
 
lib/python3.6/dist-packages
-- 
--   Python (for build):            /usr/bin/python2.7
 
/usr/bin/python2.7
-- 
--   Java: 
 
--     ant:                         NO
--     JNI:                         NO
--     Java wrappers:               NO
 
NO
--     Java tests:                  NO
 
NO
-- 
--   Install to:                    /usr/local
 
-- -----------------------------------------------------------------
 
/usr/local
-- -----------------------------------------------------------------
-- 
-- Configuring done
-- Generating done
-- Build files have been written to: /opt/opencv/build/opt/opencv/build