This video was great!
I wish you would have shown your tracks and how much you were sinking in, though. Even though conditions could have changed the last day or so since the tracks were made.
But, the fact that those BF tracks were sinking in twice as deep as the surrounding deer tracks, with a much larger surface area, tells me that the BF was significantly heavier than the average whitetail deer of about 130 lbs. I would guess at least a 400lb creature.
I'm 6'2" with a size 13 foot, and my footprint is 10" long; very close to the track size you found. I weight just under 300lbs. So definitely a juvenile BF of about the same height could easily weight another 100lbs with all the muscle mass they are known for.
Wow! Great find!