Only official videos by a rights-holder will be accepted, while this can be a CM, a PV is preferred when possible.
If the video has been region-locked, then YouTube re-uploads or Dailymotion uploads are accepted.
The ID is located at the end of the YouTube video URL.
For example, the ID for https://www.YouTube.com/watch?v=fq3abPnEEGE is
To add a Dailymotion video, prefix the Dailymotion video ID with