The Frisco Kid starring Harrison Ford is probably one of the very few kosher movies. It might be just one big leitzunes show, but it’s hardly treif. Truth is that movies shouldn’t be a problem THEORETICALLY.
Practically, it’s nearly impossible to have one that’s mamash ok.
And to know if a movie is ok in the first place, someone would have to be the korban to test it for everyone else.
Asur or not, it’s not ratzon Hashem for certain. And if you’re learning full time, it’s a for sure a complete stirah.
(Actually, I just remembered a couple of not so parve moments in the Frisco Kid. So I guess there might not be any kosher movies afterall..)