Looks to be at least 4 ft. long (possibly over 5 ft.), approximately 1 inch to 1 and a half inch diameter piece of ReBar. The 'knurling' / 'ribs' (don't know the proper term, but characteristic of all concrete reinforcement bars l know of) on the surface of the bar can be clearly seen, starting at 1:28 as the person that picks up the bar from the sidewalk, exits the bottom of the frame.

This looks like a very slick/experienced 'Crew', pretty sure job was 'Cased'/'Scoped' in advance. Absolutely no hesitation or fumbling from either the Muscle or the Blocker (he blocks/obstructs the view from inside the business for the few seconds his partner needs).
Lever is inserted between the arms of the U shackle, just above and parallel to the cross bar then rotated 90 to 180 degrees or so.
Unfortunately, while I FEEL Confident this is a low end U-Lock (for example: Big Box/Dollar store, Big 'K's "Keeper" level/quality certainly, maybe even up to "series 2" or O.G./Magnum "Bulldog" level/quality, it is a very large and solid piece of ReBar after all) due to poor video quality l can't positively I.D. the lock in the video.

My thanks to the O.P. for this Excellent example of piss poor locking technique (I'm certain Hal Ruzal would've given the owner/victim an 'F', maybe a 'D' if he was feeling charitable, at least the owner/victim Wasn't Using a Cable Based lock). And how Brutally/Breathtakingly fast the actual theft of a "Locked" bike can be.