title: cv has no member BackgroundSubtractorMOG
body: <p>I am new to opencv and followed instructions to install it as described here:
  <a href="http://docs.opencv.org/doc/tutorials/introduction/windows_install/windows_install.html#windows-installation" rel="nofollow">http://docs.opencv.org/doc/tutorials/introduction/windows_install/windows_install.html#windows-installation</a>
  I used the section "Installation by Making Your Own Libraries from the Source Files", which worked well (using Visual Studio 2013). I am able to run basic commands, like read an image, write an image, run edge detection, video processing etc. 
  But now I tried to use BackgroundSubtractorMOG and I get the error that BackgroundSubtractorMOG is not a member of cv. The simplest code is below and I don't know where to start. Am I missing something in my installation? Any ideas?</p>
  
  <pre><code>#include "stdafx.h"
  #include&lt;opencv2/opencv.hpp&gt;
  
  int main()
  {
      cv::BackgroundSubtractorMOG bg;
      return 0;
  }
  </code></pre>