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it's my code. my first video frame loaded and I select a ROI. but when I choose ROI I cant see the rectangular. it' my firs problem. after that I don't know how track it with camshift algorithm.

please help me.

#include <opencv2/core/utility.hpp>
#include "opencv2/imgproc.hpp"
#include "opencv2/videoio.hpp"
#include "opencv2/highgui.hpp"
#include "opencv2/video/tracking.hpp"

#include <iostream>
#include <ctype.h>

using namespace cv;
using namespace std;


bool backprojMode = false;
bool selectObject = false;
int trackObject = 0;
bool showHist = true;
Rect selection;
int vmin = 10, vmax = 256, smin = 30;
Point pt1, pt2;
Mat cap_img;
int drag = 0;
void mouse_click(int event, int x, int y, int flags, void* param);

//In main open video and wait for roi event to complete by the use.
// You capture roi in pt1 and pt2 you can use the same coordinates for processing // //subsequent frame
int main(int argc, char *argv[])
{

int frame_num = 0;
int non_decode_frame = 0;
int count = 1, idx = 0;
int frame_pos = 0;

//cout << "Video File " << file << std::endl;

VideoCapture input_video("C:/Users/a/Desktop/PHD_TERM2/OPEN_CV/HW/2gui/gui2/data/trt1.avi");

//waitKey(30);
while (input_video.grab())
{
    cap_img.release();

    if (input_video.retrieve(cap_img))
    {
        namedWindow("My_Win", 1);
        rectangle(cap_img, pt1, pt2, CV_RGB(255, 0, 0), 3, 8, 0);
        imshow("My_Win", cap_img);
        setMouseCallback("My_Win", mouse_click, 0);


        //Wait here till user select the desire ROI
        waitKey();


        std::cout << "Got ROI disp prev and curr image" << std::endl;
        std::cout << "PT1" << pt1.x << " " << pt1.y << std::endl;
        std::cout << "PT2" << pt2.x << " " << pt2.y << std::endl;

        Mat curr_img_t1;
        Mat roi2(cap_img, Rect(pt1, pt2));
        Mat curr_imgT = roi2.clone();
        cvtColor(curr_imgT, curr_img_t1, CV_RGB2GRAY);

        rectangle(curr_imgT, pt1, pt2, CV_RGB(255, 0, 0), 3, 8, 0);
        imshow("curr_img", curr_imgT);

        // Do remaining processing here on capture roi for every frame
        waitKey(1);
    }
}

}

//Callback for mousclick event, the x-y coordinate of mouse button-up and button-down 
//are stored in two points pt1, pt2.
void mouse_click(int event, int x, int y, int flags, void *param)
{

if (event == CV_EVENT_LBUTTONDOWN && !drag && !selectObject)
{
    cout << "Mouse Pressed" << std::endl;

    selectObject = true;
    pt1.x = x;
    pt1.y = y;
    drag = 1;
}
if (event == CV_EVENT_LBUTTONUP && drag && !selectObject)
{

    Mat cl;
    std::cout << "Mouse LBUTTON Released" << std::endl;

    pt2.x = x;
    pt2.y = y;
    cout << "PT1" << pt1.x << ", " << pt1.y << std::endl;
    cout << "PT2" << pt2.x << "," << pt2.y << std::endl;

    rectangle(cap_img, pt1, pt2, CV_RGB(255, 0, 0), 3, 8, 0);
    imshow("Clone", cl);
    selectObject = true;
    drag = 0;
    trackObject = -1;

}
if (event == CV_EVENT_MOUSEMOVE && drag && !selectObject)
{
    Mat img1 = cap_img.clone();
    pt2.x = x;
    pt2.y = y;
    rectangle(img1, pt1, pt2, CV_RGB(255, 0, 0), 3, 8, 0);
    imshow("Select ROI", img1);
}

}