This video was apparently uploaded to the Canon YouTube Channel back in July. However, it's an unlisted video – meaning it doesn't show up in the channel content or in searches. I stumbled across it on the CDLC this morning.
From the Canon USA YouTube Channel:
Join Canon Digital Learning Center contributor Jem Schofield as he shows how to use the various AF Modes built into the Canon EOS 70D when recording video.
B&H carries the Canon EOS 70D.