You have one issue that you need to be aware of. It can probably be handled, but you definitely need to talk with the lawyer about it.
There is a presumption that the photographer/videographer owns the copyright to their work. You can overcome that presumption, but it is still there.
At this point your only option is to bring a lawsuit, and there are a number of different matters involved so you will need to talk to your lawyer and see which way to go. I suspect you are going to have to file in federal court
and claim a copyright violation as well as a breach of contract
claim. At the same time you can ask the court to issue an injunction about him doing anything with the footage until the case is decided.
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