In Washington (the state) before we went to all mail in voting, it was specifically illegal to put cameras in polling places.
I know it was in my thought processing as I got into this thread.
I never meant for a camera to be IN a poll, but to observe whatever distance requirements might be (anyone that has worked a poll on election day knows what I mean) outside the polling place.
I think a movie/video camera could be aimed to take the image of a voter from the neck/chest down, obscuring facial identity for about 98% of the voters.
American adults are on average, 5' - 5' 6" on the shortest side of the scale, and all voters have to be at least 18 years old, so I think a 12 hr video could capture a valid "count of voters"