normal_opencv.cpp

#include <opencv2/opencv.hpp>
#include <iostream>

using namespace cv;
using namespace cv::bgsubcnt;
using namespace std;

int main( int argc, char** argv )
{
    VideoCapture cap;
    cap.open(0);
    if( !cap.isOpened() )
    {
        cout << "Could not initialize capturing...\n";
        return 0;
    }
    namedWindow("FG", 1);
    
    Ptr<BackgroundSubtractor> pBgSub = createBackgroundSubtractorMOG2();
    
    for(;;)
    {
        Mat frame;
        cap >> frame;
        if( frame.empty() )
        {
            break;
        }
        Mat gray;
        cvtColor(frame, gray, COLOR_BGR2GRAY);
        Mat fgMask;
        pBgSub->apply(gray, fgMask);
        Mat fg;
        frame.copyTo(fg, fgMask);
        imshow("FG", fg);
    }
}