I've no idea on the law specifically, but I guess one of the main questions would be why did you get out of the car.
My take on it, he tries to overtake, unclear who is right or wrong as no video, though I would side with you on this. I overtake on the outside sometimes, but not in that type of situation.
Verbal altercation on both sides. He pulls in front, more verbals, looks like he bangs on front of truck (I guess that would be key). looks unlikely to have caused any damage though.
Next question would be why do you get out? To check for damage, to confront him etc.
Next time we see you both, you are holding him. Question is are you legally able to hold him like that, and is he just trying to get away at that point - you look stronger than him (I assume there is no reason he could not go at the point?). He starts punching, but is that just so you would let go of you. You appear in the video, once you are out of the cab, to be the one 'chasing' him not vice versa.
I'd be surprised if he was charged, and with only part of the story I don't think either of you cover yourselves in glory, as Neil says above looks like it could have been diffused, but I accept I was not there not did I see or hear everything.
Not sure the other guy should have taken the bike from under him like that either.
Anyway, glad you are ok and hope your next journey is a bit more stress free - I think a new radio station might help with that!