Starting with iOS 6 Apple Lossless Audio CODEC (ALAC), blocked the possibility of playing video clips in the background and listening to the audio part of a clip using the task switcher. Apple has not explained why it decided to exclude this functionality from its operating system, but it can be reactivated very easily with the help of a tweak named BgVideo. By installing this tweak you will re-implement the function removed by Apple and you don't have to do anything more than open a video clip in the background and play it again using the task switcher.
BgVideo can be found in the repo http://cydia.myrepospace.com/bestguyhaha al Cydia and it is only necessary on iOS 6.
Thanks to M.
