func (writer *VideoWriter) WriteFrame(image *IplImage) int {
	rv := C.cvWriteFrame((*C.CvVideoWriter)(writer), (*C.IplImage)(image))
	return int(rv)
}
func (writer *VideoWriter) WriteFrame(image *IplImage) int {
	rv := C.cvWriteFrame((*C.CvVideoWriter)(writer), (*C.IplImage)(image))
	return int(rv)
}
/* write frame to video file */