int XvStopVideo(Display *dpy, XvPortID port, Drawable draw);
Specifies the connection to the X server.
Specifies the port for which video is to be stopped.
Specifies the drawable associated with the named port.
stops active video for the specified port and drawable. If the port
is not processing video, or if it is processing video in a different
drawable, the request is ignored. When video is stopped a
event with detail XvStopped is generated for the associated drawable.