It's up to you whether you want to press charges at this point (when the police respond, in our jurisdiction, and they observe visible injuries at the scene, arrest is mandatory, and prosecution is not optional). Think about what YOU want. You may well be right that AT THIS POINT it will only open another can of worms. You are in a place of safety now. You could still hold onto the video in the event of a future physical confrontation. Sometimes evidence of prior incidents is admissible to prove absence of mistake or accident, to prove intent to injure.
Think about what is best for you. If your only goal is to get others to "see the light" about him, I think I would pass.