Honestly sounds like leaving was more beneficial than it would have been if he left and you stayed!

Nothing will settle your emotions than getting the last laugh when he’s fired

it’s actually illegal to record someone without their consent. He wasn’t afraid for his life so there’s no reasonable cause. I’d tell your old work that. If others at work have seen the video they are also liable. If theres a HR notify them and warn them that legal action can come from his actions