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