I watched the NASCAR race at Infinion this afternoon. They had super imposed these signs that said "turn 2" "turn 3" etc. How is that done one live TV? The way they were panning around, I don't understand how that could stay within the frame and not move like all the images for Bill Engvall's show.

Same deal with football... the line of scrimmage stays when the camera moves. How's it work? (Don't say "computers"

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