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