opencv 3.0 rc1, background subtraction mog2 example code

This is mog2 example code in opencv 3.0 rc1 version.

It will be help when you convert opencv 2.x code to 3.x opencv version.
Thank you.

This is mog2 example of 2.4.9 version.
http://study.marearts.com/2015/05/basic-mog2-example-souce-using-opencv.html

...

#include < iostream>  
#include < opencv2\opencv.hpp>  
#include < opencv2\videoio.hpp>  
#include < opencv2\highgui.hpp>  
//#include < opencv2\core\cuda.hpp>
#include < opencv2\core.hpp>
//#include < opencv2\bgsegm.hpp>
#include < opencv2\cudabgsegm.hpp>

#ifdef _DEBUG             
#pragma comment(lib, "opencv_core300d.lib")     
#pragma comment(lib, "opencv_highgui300d.lib")  
#pragma comment(lib, "opencv_videoio300d.lib")  
#pragma comment(lib, "opencv_cudabgsegm300d.lib")  

#else     
#pragma comment(lib, "opencv_core300.lib")     
#pragma comment(lib, "opencv_highgui300.lib")  
#pragma comment(lib, "opencv_videoio300.lib")  
#pragma comment(lib, "opencv_cudabgsegm300.lib")  
#endif      

using namespace std;
using namespace cv;
int main()
{

 //
 
 VideoCapture cap("M:\\____videoSample____\\blog\\video20.wmv");
 //VideoCapture cap("M:\\____videoSample____\\posco\\cartype1.avi");
 
 //
 Ptr< cuda::BackgroundSubtractorMOG2 > MOG2_g = cuda::createBackgroundSubtractorMOG2(3000, 64); 
 Mat Mog_Mask;
 cuda::GpuMat Mog_Mask_g;

 //
 Mat o_frame;
 cuda::GpuMat o_frame_gpu;
 

 cap >> o_frame;
 if (o_frame.empty())
  return 0;

 /////////////////////////////////////////////////////////////////////////    


 unsigned long AAtime = 0, BBtime = 0;

 //Mat rFrame;    
 Mat showMat_r_blur;
 Mat showMat_r;

 namedWindow("origin");
 namedWindow("mog_mask");

 while (1)
 {
  /////////////////////////////////////////////////////////////////////////    
  cap >> o_frame;
  if (o_frame.empty())
   return 0;


  o_frame_gpu.upload(o_frame);
  AAtime = getTickCount();

  //
  MOG2_g->apply(o_frame_gpu, Mog_Mask_g, -1);
  //pMOG2_g.operator()(o_frame_gpu, Mog_Mask_g, -1);
  //  
  Mog_Mask_g.download(Mog_Mask);

  BBtime = getTickCount();
  float pt = (BBtime - AAtime) / getTickFrequency();
  float fpt = 1 / pt;
  printf("gpu %.4lf / %.4lf \n", pt, fpt);



  o_frame_gpu.download(showMat_r);
  imshow("origin", showMat_r);
  imshow("mog_mask", Mog_Mask);


  /////////////////////////////////////////////////////////////////////////    

  if (waitKey(10) > 0)
   break;
 }

 MOG2_g.release();

 return 0;
}

...