I'm the experton this...as you should know.
TUE was an idea. An idea encircled by evidence such as subtle hints from Bungie, secret code in the Game's Hex-files and so on.
TUE...sadly was never found. That is, if it existed...in whatever form it took.
Another sad thing to note is, TUE was and still is mistaken for "The Mystery Of The Gate"...which is exactly what you're probably asking to see.
TMOTG was rubbish...utter rubbish. Yes, I admit, I was one of the original peopel to hypothesize the idea, but we discovered that it was false, through vast amounts of searching and testing. Yes there's a Switch there on Delta Halo, and yes there's a Trigate which is really just a triangular-shaped texture glitch; but ultimately, TUE was never discovered/proved.
TUE in H3 however...is an entirely different concept. One parallel to the idea of IWHBYD, only more absolete and incredulous. Again, it hasn't been proved, found or properly expanded upon.
There's no real need to see the Mystery Of The Gate Video...unless you need it for some other reason than attempted to figure TUE out from it.