My partner before my DH used to do similar - although no filming.
I was young. I didn't leave him for that - but more because I just found over time I fell out of love with him, and I met someone else (my DH!).
The passing of time and reading stuff on Mumsnet has made me realise that he was abusing me - he was doing things to me in my sleep when I could not consent. He could not reasonably believe I was consenting, because I was asleep. You are vulnerable when you are sleeping - and when you are sleeping in your bed, in your home, with your husband, you have an absolute right not to be abused. You have a right to feel safe while you're sleeping.
Thinking back to it now makes me feel sick, physically ill, and I am ultra sensitive to issues around rape and consent now. I find discussions about consent very triggering - because what he used to do to me, I had no choice over - I was unconscious. His plaything.
Strangely, he was the also considered the nicest man, very nice, gentle etc. It's very difficult to reconcile that in my head. I moved away, and have completely lost touch with him now - but after we split, he went out with a colleague who I knew quite well. I wished her well - but I've often wondered if he did the same to her 
for you.