Mr Brizzell said he posted the video because he wanted to identify his alleged assailant.
The video shows Mr Brizzell asking another man to move to the side of the path to let him pass.
"He was holding me up pretty badly,'' says Mr Brizzell.
"Trail etiquette says you pull over to let faster riders by. He kept saying yes but wouldn't give me a space. There were plenty of spots for him to pull over but he wouldn't.''
Asked again, the slower rider, who was wearing a yellow Rock Shox Racing top and tinted sunglasses, gets off his bike and confronts Mr Brizzell, saying he doesn't need "a f****** lecture'' while enjoying a ride.
The man appears to knock Mr Brizzell to the ground, where a struggle ensues.