This was captured in offline mode vs. the CPU as I was playing @Randzz. Not touching online until everything gets patched up on Tuesday, lol. As for hiding online GTs, the trick that I found out is to go into your replays, then sign out of your profile and then load the replay. It will hide both gamertags. That's the trick that I know from the 360 that works.
Offline or online; & did you 1st save it to your system then record (my thing is the GT stuff, not everyone wants their GTs shown, especially if they lost)? You can certainly see the difference between the game capture & the normal upload to youtube though.