You can only submit videos from Youtube at this time.
You have three ways to submit a video:
1. Submit a channel URL if all the videos in this channel are related to Drupal. In this case all the videos of this channel will be retrieved. In the future, new videos will also be retrieved automatically on a regular basis from this channel. Eg. https://www.youtube.com/channel/UC--IusnuLuIGptCgCPss1Og or https://www.youtube.com/user/AcquiaTV
2. Submit a playlist URL if all the videos in this playlist are related to Drupal. In this case all the videos of this playlist will be retrieved. In the future, new videos will also be retrieved automatically on a regular basis from this playlist. Eg. https://www.youtube.com/playlist?list=PLpVC00PAQQxHoBSZqQ2rFVZRHOU7a2KMA
3. Submit a video URL In this case only this video will be retrieved. Eg. https://www.youtube.com/watch?v=dkjKNGQL3ic