Please understand that the voting process is deliberately designed in a way to make it nearly impossible for you to "prove fraud". To wit:

• You see someone pull up to a ballot drop box and dump in 10 ballots. In many States your video isn't proof of fraud because those States allow you to drop off ballots from family members or household members and because you don't who that person is and your video doesn't show the names of the people being deposited, by the time you make the claim it's basically impossible to prove.
• You walk into a room at an election counting site and see 4 people filling out ballots. Evidence of fraud because polling is closed? Oh, you're just confused, those people were spoiling ballots that the machine couldn't read and duplicating it onto a new ballot they could scan.

Most places don't allow recording in places where ballots are being counted and if they did you couldn't get close enough to glean anything meaningful from the ballots. They do not want elections secure or verifiable.