dont think u can on consoles (thats why PC is better )
when i watched the warthog jump video...i read that he did it on a TV with a built in VCR. Then he played and started recording....then he converted the VHS tape to digital (using software such as Pennicle Studio) then edited it.
However the downside is when u start recording it has a performance effect on ur computer...so it brough down my FPS from 91 to 30 lol...which made it extremely hard to play and make good shots...so my friend got on my dads computer...joined the same server that i was on...then spectated me. he then recorded the video on my dads comptuer...while i played on mine and i could then work my skillz.