The comments attached to the video show that the video was uploaded by David Campbell himself, and that he changed the song.

He posts at YouTube under the name "marakakore" and his YouTube channel is here:

http://www.youtube.com/user/marakakore

That page has this information about him:

Born in Guyana, South America, of Arawak Indian and Portuguese ancestry. Resident of Vancouver, Canada. Song writer/singer/guitarist/poet/picture maker/prose writer/blogger/photographer/maker of videos/recording artist[29 albums]/student of life and conscious journeyer.
Country: Canada
Occupation: Song writer/singer/Guitarist/Poet/Video Maker
Interests: Walking/blogging/making walking sticks/story telling.
MORE BIO INFO: 2 Life Time Achievement Awards...5 Books.
Music: Please check playlists re different subjects covered.

Furthermore, he has a Facebook page:

http://www.facebook.com/davidcampbellsongmaker

Two albums at CDBaby:

http://www.cdbaby.com/Artist/DavidCampbell

And a blog:

http://www.wadili.blogspot.com/

He's obviously a multitalented and interesting guy.

By the way, the video gives the web address www.davidcampbellarts.com--which is the same address given a couple of times above.

I tried to go to that site and Google tells me:

Oops! Google Chrome could not find www.davidcampbellarts.com
Did you mean: www.davidcampbellart.com

So I clicked on that address and the web site is about an artist (of drawings and paintings) and his CV doesn't say anything about music, so I conclude it's a different guy.