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an old question but i recently tried something like

#include "opencv2/videoio.hpp"
#include "opencv2/video.hpp"
#include "opencv2/highgui.hpp"

using namespace cv;
using namespace std;

const int nmixtures = 10;
const bool shadow = false;
const int history = 1000;

Ptr<BackgroundSubtractor> back_obj = createBackgroundSubtractorMOG2(history, nmixtures, shadow);

int main(int argc, char** argv) {

    Mat original, background, foreground;
    VideoCapture cap(0);
    vector<vector<Point> >contours;

    int counter = 0;
    double learningRate = -1.0;

    while (1)
    {
        counter++;
        if (counter < 5)
            learningRate = 1.0;
        else
            learningRate = counter > 30 ? 0.0 : -1.0;

        cap >> original;

        back_obj->apply(original, foreground, learningRate);
        back_obj->getBackgroundImage(background);

        findContours(foreground, contours, RETR_EXTERNAL, CHAIN_APPROX_NONE);
        drawContours(original, contours, -1, Scalar(255, 255, 0), 3);

        imshow("ORIGINAL", original);
        imshow("BACKGROUND", background);
        imshow("FOREGROUND", foreground);

        int key = waitKey(1);

        if (key == 32)
        {
            counter = 0;
        }

        if(key == 27)
            break;
    }
    return 0;
}