{TAIL ~ Modifications} can be temporally made to all frames in a video stream, selected frames in a video stream, or a single frame in {HEAD ~ a video stream} 
{ TAIL ~ Modifications } can be temporally made to all frames in a video stream , selected frames in a video stream , or a single frame in { HEAD ~ a video stream }
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD