On this forum and on GMFullSize.com you use "yt" tags with the videoID. On Camaro5.com it's the same except you use "u2b" tags.
The videoID is a nonsense string of characters in the URL that you learn to recognize after finding a few. It is after an equal sign and usually followed by an ampersand ("&").
As with the picture post, you can quote this to see how I did it.
Code:
http://www.youtube.com/watch?v=1LJHrVXVr-c&feature=channel_page
VideoID: 1LJHrVXVr-c
Video pageFull screen