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Which version of OpenCV do you use? createBackgroundSubtractorMOG was added in master branch and will be available in the next major release. In 2.4 version BackgroundSubtractorMOG is used that way:
BackgroundSubtractorMOG mog;
mog(frame, fgMaskMOG);
And don't forget to include opencv2/video/video.hpp header.