Post Format: Video (WordPress.tv)

Posted as per the instructions in the Codex.

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.

Post Format: Video (YouTube)

Learn more about WordPress Embeds.