WebCam not working

edit

could you try the code below

#include "opencv2/highgui/highgui.hpp"
#include "iostream"
using namespace cv;

int main( int argc, char** argv )
{
    std::cout << getBuildInformation();
    int empty_frame_count = 0;
    VideoCapture cap(0); // open the default camera
    if(!cap.isOpened())  // check if we succeeded
        return -1;

    for(;;)
    {
        Mat frame;
        cap >> frame; // get a new frame from camera
        if(frame.empty())
        {
            empty_frame_count ++;
            if(empty_frame_count > 20) break;
            frame = Mat::zeros(480,640,CV_8UC3);
            waitKey(100);
        }

        imshow("VideoCapture", frame);
        if(waitKey(30) >= 0) break;

    }
    return 0;
}

I have the same problem as you. Dumb trick to work on Ubuntu (sorry, no idea about Windows), uninstall OpenCV and install the default: sudo apt-get libopencv-dev. But I am trying to figure out why version (2.4.13) does not open the webcam, 3.2 works fine, I must be forgetting some flag or setting....