Modifications can be spatially made to an entire video frame, {TAIL ~ one or more selected regions} of a video frame, or one or more individual pixels of {HEAD ~ a video frame} 
Modifications can be spatially made to an entire video frame , { TAIL ~ one or more selected regions } of a video frame , or one or more individual pixels of { HEAD ~ a video frame }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD