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I slightly changed the code i've found from some website that i do not remember anymore.

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

int main ()
{
  cv::Mat frame;
  cv::Mat back;
  cv::Mat fore;
  cv::VideoCapture cap (0);
  cv::BackgroundSubtractorMOG2 bg;
  bg.set ("nmixtures", 3);
  bg.setBool("detectShadows", false);

  std::vector < std::vector < cv::Point > >contours;

    cv::namedWindow("Frame");
    cv::namedWindow("Background");

    for(;;)
    {
        cap >> frame;
        bg.operator ()(frame,fore);
        bg.getBackgroundImage(back);
        cv::erode(fore,fore,cv::Mat());
        cv::dilate(fore,fore,cv::Mat());
        cv::findContours(fore,contours,CV_RETR_EXTERNAL,CV_CHAIN_APPROX_NONE);
        cv::drawContours(frame,contours,-1,cv::Scalar(0,0,255),2);
        cv::imshow("Frame",frame);
        cv::imshow("Background",back);
        if(cv::waitKey(30) >= 0) break;
    }
    return 0;
}