Sorry dude, you're screwed...
No shit, I do this for a living and was called to assist with a Wal-Mart robbery that happened back in 1999-2000 when I was still in Law Enforcement. One of Wally World's Fort Worth locations got robbed and a manager was killed, shot through the head after a struggle for the gun with one of the perps in the cash room. It was hard to watch, knowing that the manager was killed, because during the struggle it looked like he was going to win. He beat the shit out of one of the perps while they struggled for the gun but the final frame showed a bullet exiting the side of his head.
The regional manager of Wal-Mart North Texas had heard from a Texas cop that we were experts in video enhancement so they flew into Tulsa International Airport. I picked her up at the airport and the only luggage she had was a VHS tape that she was clutching in her hands. The tape was piss-poor quality (VHS, whaddya expect?) PLUS the fact that it had been left in the VCR for over 6 months prior to the hold-up. The lazy bastards use the cheapest tapes they can find ( $.99 for a tape in a $1,200.00 Time Lapse unit) and then they set it on "Auto Rewind" so that if nothing happens at the end of 24 hours the tape will rewind and start recording on itself again. If something bad happens then they go pull the tape. This particular tape had been layered (re-recorded) over 180 times as it was 6 months old...
ANYWAY, we started by playing the tape back frame-by-frame in an AVID playback unit (check with your local TV station for more information...) and captured the frame images to jpeg's, then we had to discard about 2/3's of the frames as unusable. We then found ONE JPEG'd FRAME where, during the struggle, the manager caught his ring in the perp's ski mask just enough to pull the mask up over his face. The frame locked the picture before the perp could pull the mask back down over his face. THEN we made about 50 passes through Adobe Photoshop with lighting, color correction, contrast, and then all over again and again and again about 50 times until we gave up with the finished frame. The finished frame was sent to every LEO agency and every TV station in the Fort Worth area. Thank God one of the Wal-Mart employees recognized the perp as a former employee of the same store who had been fired a couple of months before the heist. The former employee had also studied the Wal-Mart count out routine in the cash room and knew all the moves. In summary, the perp is now a convict and is counting his appeals until he gets to ride the "silver surfboard" straight to hell where he belongs.
The manager left a pregnant wife and 3 kids...and Wally World almost blew it by trying to save a few pennies on a stupid VHS tape.