This is Nogg-aholic - The Movie. This movie shows a player called Dopefish exploring different areas in World of Warcraft. It was made in 2005 before wall-walking was fixed in patch 1.9. Unfortunately, many of the regions you can see in this movie can't be explored anymore. The following are quotes of the creator of the movie:
This is the long awaited sequal of Exploration the movie, I hope it hasn't became too hyped because of all the delays. Its been in over two months of production with over 50gb of raw data and almost 400 of unique clips, and it only took 19 hours to render the movie. Enjoy!
Credits - NAC Bumps
00:00 - Dopefish, Insect Chorus
Skullmonkeys - Wawawawa
00:16 - Malu05, Us who alter the world
Massive Attack - Angel
00:32 - Dopefish, The dead man and the salmon
ExtremeMusic - XCD121_16: Lowlander
00:49 - Linkar, Something weird
01:04 - Dopefish, Polaroids of Death
ExtremeMusic - XCD097_06: Science Reliance
01:20 - Dopefish, Faraway Dream
Vincent Diamante - Cloud (Ingame loop2)
01:36 - Malu05, Most of them doesn't make it
Minor Chill - Requiem for Mikael
Additional credits goes to Shajn/^shn for providing images that was used for Insect Chorus, Polaroids of Death and a Faraway Dream.
"You may clip our wings, but we will always remember what it was like to fly"