Modifications can be temporally made to all frames in a video stream, {HEAD ~ selected frames} in a video stream, or a single frame in {TAIL ~ a video stream} 
Modifications can be temporally made to all frames in a video stream , { HEAD ~ selected frames } in a video stream , or a single frame in { TAIL ~ a video stream }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL