First you need download, configure and build FFmpeg. For this open console and type in

cd kxmovie
git submodule update --init	
rake

1. Drop files from kxmovie/output folder in your project.
2. Add frameworks: MediaPlayer, CoreAudio, AudioToolbox, Accelerate, QuartzCore, OpenGLES and libz.dylib

For play movies:

ViewController *vc;
vc = [KxMovieViewController movieViewControllerWithContentPath:path error:nil];
[self presentViewController:vc animated:YES completion:nil];

Also, see KxMovieExample demo project as example of using. Remember, you need to copy some movies via iTunes for playing them.

at least iOS 5.1 and iPhone 3GS

Tweet me — @kolyvan_ru.