I could in principal see something that isn't clearly entirely derivative, like if a person takes their own original thought and uses generative AI to make it into a video instead of, for example, learning animation and animating it or finding (probably amateur) actors to film it with. This of course still has some derivative aspects that may be easier to avoid than in the non-generative-ai case, but it is also clearly distinct from a 100% generative AI case.

For example, ever since roughly the mid 2010s when I finished Star Trek: Enterprise, I've been thinking about someone using some sort of generative AI to complete this series, once its good enough to be entirely convincing.