Hello,
I have a lot of experience developing software for Raspberry PI that uses hardware acceleration for video processing. I have developed a video transcoder for RPi that transcodes an MPEG-2+MP2 Audio stream into H264+AAC in real time. Also I have developed a video player for RPi that can play several videos at once, each in the specified region on the screen.
I can help you to make working the PiOmxPlayer. I guarantee you fast and quality work. I have Raspberry PI Model B for development and testing.
Thank you.