There have been a few cases of generative AI being used in movies and TV but they've been called out pretty loudly, definitely not award winning.

The worst example I've seen was the title sequence from the Marvel show Secret Invasion in 2023, which I think was the worst show Marvel have put out (independently of the awful title sequence.)

I've got the impression that concept art for movies is heavily AI generated now. Directors like being able to spin up a visual concept from a prompt as part of the development process. The concept artists are really suffering.