You can watch movies on your Apple device with iOS 9 and higher. Just download the app from iTunes.
Start a movie
In order to start a movie go to the detail page by clicking on the image. Then hit the start button.
You can fast forward and rewind the movie by either clicking on the progress bar or moving the point to the desired spot by holding it with your finger.
Change audio and subtitles
If the movie has different audio or subtitles a small menu in the upper left corner will appear. When you click on it you can make your selection.