Grizzly man movie

It's a real story of a man who spent months with Grizzly bears.
During this time he shot 100s of hours video of Grizzle bear from a distance too close to be comfortable.
In these videos, you can see him shooting/commenting himself with the help of tripod.
He got killed/eaten by a bear and he is from LongIsland, NY.

Highlights of the movie are

1) Closeups of bears, scenes of bears fighting, etc..
2) Why he preferred bears for human society?
What made him to isolate himself from society for seasons and live in mountains?