Video artist, Bill Viola, talking about his piece, Ocean Without A Shore that was installed at the 2007 Venice Biennale. I found this on the Tate's video channel (thanks to Vincent Romaniello for posting the link to the site).
Video description from the website:
Bill Viola's latest video installation, Ocean Without a Shore, is presented in the atmospheric setting of the church of San Gallo, Venice. Monitors positioned on three stone altars in the church show a succession of individuals slowly approaching out of darkness and moving into the light, as if encountered at the intersection between death and life. Viola talks about his artistic intentions and the technical challenges of the piece.
There are quite a few other videos on the Tate Channel featuring interviews and artist talks from a range of artists.