Jailbreak community gave us a very useful plug-Universal Video Downloader This plug-in allows users to extract video content from iOS applications, that is, the user can save online video to prepare for offline use.
When an iOS application video content play then the Universal Video Downloader will issue a notice to the user and also provide help to extract the video and saved in the iPhone’s video library (sometimes you need to use iFile to extract the video).
In addition, some video content, although the user can offline viewing application, but they may not share the content of these videos outside Universal Video Downloader can not see these content. ??
If you Need this plug-in you can get it from BigBoss repo in Cydia for free.