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