Unless there are clearly people doing some fraud like bubbling in blank ballots, then it would be better to hold off.

You take it, id people in the tape, then question them without them seeing the tape. If they see what's on tape ahead of time, they can try to make up excuses for what can be seen on the tape. But ask them what they were doing on that day and time and it is much harder to lie when they don't know what you know.