Then yes, you're good to go. KitKat affected write access for non-system apps, but read privileges are still intact, so if you created the folder in your computer and moved files in there, you can watch them in your phone with the appropriate app without issues. If you, however, want to copy a movie from one place to another (using an app in your phone, like a File explorer) then that's where you might encounter issues. Basically, if the app didn't create the folder, it doesn't have write access to it.