[SWFLguy]

The high school at which I taught had a video club that taped all
games, home and away, they had 5 cameras and a game tape was made with replay that aired over the local community access channel. I never worked their games (of course) but would get a copy for any officials who did.
You're right that the cameras are on the players, so you may not see
much of your own movements on the film; but it may show stuff at the point of attack that you may have missed. It also may vinidcate you when you make that great call !!
Once in a while I worked a "game of the week" in our area which was taped by the cable folks, and got to see myself in action. I did catch myself doing little things like tugging up on my pants, that helped me break those habits.
In a way, it's too bad that we all can't critique ourselves more !