by the way compliments because you have near found the right configuration for this data source.
I think the problem is that the field set as ID is not so called by JomSocial component, so instaed of ID it's probably named for example VID or something similar.
For this reason you get:
The setup I have now shows this for the links http://www.websitedomain.com/video-gallery/913-help-desk/video/?id=672
where is evident the untraslated chunk ?id=672
The better way to discover it, is disable for a while Joomla SEF rewriting and examine the raw query string used by JomSocial.
Once understood the parameter used as id, you can set an AS statement for that in the data source.
Finally if JomSocial uses a standard filed for alias activating the alias switcher should complete the work.
I try to attach a screenshot tobetter help you.
By the way if you have any need of on site help contact me at
and send me account to login.