When will AI be able to construct a full movie based on a book?

I have read in the past Ender's Game. I have also watched the movie. I am no listening to the audiobook and compare the book to the movie; and there are so many things.

I started to wander when would it be possible to "ask" some AI machine to "watch" the movie, "read the book" and create the missing pages/hours of video content.

I get it that there is IP/royalties involved, but I am not concerned on the legal issues. I am more concerned about watching the missing chapters/scenes from books I love.

And why not, perhaps even some cool books that were never made into movies...