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.
Posted as per the instructions in the Codex.
[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.
Learn more about WordPress Embeds.