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No, that would not be deemed legal under California law. I would file an injunction in court ordering him to destroy the footage and cease maliciously slandering you in public.
Have you suffered any actual damages as a result? That is a key element to a defamation/slander claim. Just emotional damages is not enough.
That meets the damages element. Yes, a lawsuit is a strong approach to take but in the interim I would get an injunction so that he stops then sue for the damage he has already done.
Let me know if you have any additional questions otherwise a positive rating would be appreciated.