I'm a photographer who has skied, mountain biked, hiked and backpacked around these beautiful ungulates, learning to read them like a book in the process.  I've learned the importance of distance vs the incredible speed this 1500 lb animal can travel as  I've been  attacked by them four times on the trails over the last thirty years I've lived in Alaska.   And I found out personally how selfish idiocy with a camera can disrupt and destroy these magnificent animals when the click of my shutter once frightened a cow with two young calves that were strolling along Brooks Lake in Katmai, compelling them to swim the river to get away.  One of the calves drowned.     You see, I've learned that distance is a sign of respect for these animals, not to mention mutual safety.   Whoever filmed this video had neither.  His only concern was with with the attention his "bravery" would win him from his drinking buddies.   

I'd be more than happy to offer more advice but I have 5 characters left.