Post Formats Post Format: Video (WordPress.tv) June 3, 2010 by Aigars Posted as per the instructions in the Codex.
Post Formats Post Format: Video (VideoPress) June 2, 2010 by Aigars VideoPress, especially as a video post format, usually provides some unique styling issues. You will need to install Jetpack or Slim Jetpack plugin to turn the shortcode into a viewable video.