Looking to embed videos from YouTube, Vimeo, or any of the other popular video sites? No problem at all. Simply take the embed video code, add it to the video settings, and you’re done.
Video source missing
Post Format: Video (WordPress.tv)
Posted as per the instructions in the Codex.
Video source missing
Post Format: Video (VideoPress)
[wpvideo tFnqC9XQ w=680] 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.
Video source missing
Post Format: Video (YouTube)
Learn more about WordPress Embeds.