Have you looked at the existing
media BBcodes as examples.
You have to find that the value is that defines the video (in the example given, it's probably the 1267643 and replace that with the {$id} parameter in the embed html box
Code:
<iframe allowfullscreen frameborder="0" width="698" height="573" scrolling="no" id="molvideoplayer" title="MailOnline Embed Player" src="http://www.dailymail.co.uk/embed/video/{$id}.html"></iframe>
and then use the match URLS's
Code:
http://www.dailymail.co.uk/embed/video/{$id}.html
I make no guarantee that this works as is - since I just took the examples provided in this thread and modified them.