And luckily for you, you can do so on Youtube:
Such Hawks Such Hounds, 2008
A lot of great bands are covered in this documentary, and I've even got a list of new bands to look in to. Fatso Jetson, Om, Comets on Fire, Mountain, Earthless, Across the River, Dead Meadow...I shall be researching your music further.
Other than those mentioned above, this documentary also gives in-depth interviews with members and former members of bands such as Pentagram, St. Vitus, The Obsessed, Kyuss, Acid King, Nebula, Sleep, High on Fire, Sunn O))), Mudhoney and more.
A few things from this documentary might be out of date since it was made 4 years ago. That doesn't stop this from being a worthy watch, though. I enjoyed the hell out of this documentary and I hope you will too. Set aside an hour and a half of your time and enjoyyyyyyyy.