There are many apps to use to get movies to stream/view on the iPad. There is Netflix, YouTube, Hulu+, Vimeo, Amazon Prime Video, etc. They are all very good and some are free.
If you are looking for current movies, may I suggest Netflix. It's about as up-to-date as it gets ... for legal streaming of movies (we don't advocate/support/give advice for going to web sites that illegally stream currently running movies).
Hope some of this helps.
Marilyn