http://stackoverflow.com/questions/4622850/how-to-record-filtered-video-for-iphone
http://stackoverflow.com/questions/3751664/how-do-i-convert-a-cgimage-to-cmsamplebufferref
http://stackoverflow.com/questions/5244768/making-transparent-video-on-ios
http://stackoverflow.com/questions/6783214/reading-video-frame-by-frame-under-ios