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The line

IplImage *ResultImage       = cvCreateImageHeader(cvSize(width,height),IPL_DEPTH_8U,1);

should be

IplImage *ResultImage       = cvCreateImage(cvSize(width,height),IPL_DEPTH_8U,1);

Or you need to use cvSetData() on ResultImage before passing to cvAbsDiff()

like

cvSetData( ResultImage, CurrentFrame, width );