LANGUAGE WARNING -- and not just for the dialect. If he didn't sound so Canadian, he'd pass for a Bostonian.
The guy's boots are squeaking on the snow. The coyote thinks it's mouse -- or some similar small, squeaky creature. Coyotes aren't terribly picky eaters. The more the man moves, the more his boots squeak, and the coyote is more certain those boots are made for gnawin'. Even when we aren't hearing it on the video, it might as well be playing on a Led Zeppelin amp as far as the coyote is concerned. He or she could probably hear what we pick up from half a quarter away.
Probably, too, from the looks of the site, this coyote is used to humans. Others may have given it food in the past while not shooting at it, thereby causing it to lose its natural fear of these crazy (two legs bad) bipeds.
I have to assume our intrepid Canadian videographer is wearing steel-toed boots. Coyotes can't generate the pressure of a Rottweiler, but their jaws should be respected. It's possible, though, that letting the coyote get hold of his boot worked out. It may have convinced this clever canine that no mouse was present. "I'm getting hints of Goodyear and Gold Bond."