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