opencv/highgui.go
func (capture *Capture) GetDomain() int {
	rv := C.cvGetCaptureDomain((*C.CvCapture)(capture))
	return int(rv)
}
func (capture *Capture) GetDomain() int {
	rv := C.cvGetCaptureDomain((*C.CvCapture)(capture))
	return int(rv)
}
// Return the type of the capturer (eg, CV_CAP_V4W, CV_CAP_UNICAP),
// which is unknown if created with CV_CAP_ANY