   Opengl ES Video
  Using opengl es (for iphone) I would like to render video with a moving green banner, then render a image over this at runtime as the images will changed dynamicly each time we run the program, so I'm guessing I will need to render each frame from the video at a time, while replacing the green area with my image file, but need somewhere to start using using chroma keyAny help is appreciatedThanks   