As the title states this video is on setting up OpenVAS in Back Track 4
OpenVAS (for those that don't know) is a free open source fork of Nessus. The video shows creating a certificate/user. Starting the server and client. Creating a task with scope and running the task.
It's really pretty easy and self explanatory. If you need help make a relevant post.

So you can watch the video here on blip.tv or on vimeo,. or youtube

Feedback is appreciated.
Enjoy.

Part two is here