How to Download Any YouTube Video on Your iPhone or iPad? You need to download PocketVideo for iPhone and iPad; http://apple.co/2b3oGlu
I do not recommend stealing any video from YouTube or Vine, this video is just to show how to do it (educational purposes, lol.) Honestly, I am surprised this app is still available for download and that YouTube hasn’t moved to have it removed from the App Store yet. or Vine/Twitter for that matter. .
I bet it won’t last long so enjoy it while you can. If you care about your YouTube channel you will not steal videos and re-upload them as your own!