Nightmare (2005)

On the brink of madness, a director's only recourse is to make a movie of the savage murders he believes he committed. The morning after a wild party, a young film student awakens in the arms of a mysterious actress. Unsure where they are, the two find a video camera at the foot of the bed aimed at them. Suspicious of one another, the lovers decide to watch the tape. Their apprehension turns to terror as they see themselves on screen gleefully committing brutal murder in the room they've just slept in.

Unfortunately the movie Nightmare is not yet available on HBO Max.