According to the YouTube description, this is Jonathan Kimble, the senior who's spending this year as the Mountaineer, WVU's (human) mascot. The costume includes coonskin cap, buckskin jacket, and a usually-unloaded musket. It's black bear season and Kimble proved, at the expense of a bear driven into a tree, that the musket's not a prop.
Between the fight song, the hounds baying, the hollering as the bear falls, and the cry of "Let's go Mountaineers," I feel safe declaring this the most West Virginia video ever.
WVU beat Baylor in Morgantown this year. Now it's 2-0.