I didn't understand something: What source can I use to get the movies? I don't know of any one.
Apps such as VLC and others need local video on e.g. a NAS which is in your local network. You could then store (in e.g. .mp4) your movies/tv series on that
NAS and watch them on your iPad or iPhone with e.g.:
VidOn Player (free)
VLC Player (free)
nPlayer (4,99 dollar)
Infuse3 Pro (free, but for full options you need in-app purchase of 9,99 dollar) - the best one with e.g.
Chromecast support, alot of audio codecs (AC3) are supported, option to show opensubtitles.org on videos.
To watch free movies there are a few (documentary) apps in the App Store or have non-popular movies in it e.g.
SnagFilms,
Viewster,
Big Star Movies (has some free movies).
Other then that you have a lot of paid services (9,99 dollar or more a month) such as Netflix, Hulu Plus, HBO, Showtime but it depends in which country you are what is offered. Ofcourse you can also buy separate series and movies at iTunes.