Do not involve your daughter in tonight's conversation, she has not done anything wrong.
Tell your son what PP said - it's wrong and you will call the police and kick him out.
Why are you more worried about him than her?
Seriously I've lived this life, you have no idea what it does to your self esteem and self respect and relationships with others.
When I had my DS, my brother started on him when he was about 4, as he was jealous of the attention my mum gave him
he was 23!
I told him calmy and firmly that if he ever did that to my son again I would call the police, I pointed out if it was a stranger doing it they would end up in prison, he got the message and my son saw me defending him (my brother is 6ft 7 and 16 stone, I am 5ft 2 and 8stone if that puts it in perspective)
YY to filming him and showing him.
Does he treat others like this outside the house? I doubt it! He's fully aware and in control of his actions.
He chooses to treat his sister like this. And you let him, stop making excuses and be a mother. Unless you want your daughter to grow up and get into relationships where she has seven kinds of shit kicked out of her and called names, why wouldn't she? You let her grow up thinking that it was normal and acceptable for her to be treated like this 
Think of the bigger picture and out your daughter first, for once.