‘BackgroundSubtractorMOG’ is not a member of ‘cv’ - c++

Question

I am working in Motion Detector Script but when i run my code i get this error every time when i use this function, but i don't know why it's wrong.
I am using opencv3, below is my code. I tried to run other examples i get it from web to same function, but the error still there. Any idea to fix it ?
This is the Error:
cv.cpp: In function ‘int main()’:
cv.cpp:23:4: error: ‘BackgroundSubtractorMOG’ is not a member of ‘cv’
My code :
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <vector>
#include <iostream>
#include <sstream>
#include <opencv2/video/background_segm.hpp>
using namespace std;
int main()
{
//Openthevideofile
cv::VideoCapture capture("/home/shar/Desktop/op.mp4");
//checkifvideosuccessfullyopened
if (!capture.isOpened())
return 0;
//currentvideoframe
cv::Mat frame;
//foregroundbinaryimage
cv::Mat foreground;
cv::namedWindow("ExtractedForeground");
//TheMixtureofGaussianobject
//used with all default parameters
cv::BackgroundSubtractorMOG mog;
bool stop(false);
//forallframesinvideo
while(!stop){
//readnextframeifany
if(!capture.read(frame))
break;
//updatethebackground
//andreturntheforeground
mog(frame,foreground,0.01)
//learningrate
//Complementtheimage
cv::threshold(foreground,foreground,128,255,cv::THRESH_BINARY_INV);
//showforeground
cv::imshow("ExtractedForeground",foreground);
//introduceadelay
//orpresskeytostop
if(cv::waitKey(10)>=0)
stop=true;
}
}

Answer 1

As #shar said, the answer is in this post. In order to create a smart pointer to the algorithm you need to do:
cv::Ptr<cv::BackgroundSubtractorMOG2> pMOG2 = cv::createBackgroundSubtractorMOG2();
EDIT:
And for use the algorithm:
float learningRate = 0.01; // or whatever
cv::Mat foreground;
pMOG2->apply(frame, foreground, learningRate);