Using the code generated from this, you’ll easily have a semantically marked up youtube video. The form will query youtube’s v3 API to get the information back about the video. The results are not stored in any of our databases, so it’s completely anonymous.
Test your code at Google’s Rich Snippets Testing Tool.
It’s one thing to do this manually, but if you are serious about semantic video, we highly recommend using the following wordpress plugins, for which Mike is the lead programmer: