I'm not sure, honestly. We'd have to look into it more. The main question is whether there is a direct link to the video page that's being posted. We've run into questions like this in the past about sharing social stream activity, and there hasn't been a good answer. When an Open Graph Action occurs, we need to tell Facebook which page to send any viewers too. That can't really be the users' profile page, since that page isn't all about the video. There would need to be a separate URL created for the 'story' which we can link to.
In previous JomSocial versions, there hasn't been a direct link available for each individual stream item. I haven't tested enough with JomSocial 3.1 to know if that's changed. Hopefully, you can check and see if there's a way to link to each individual stream item. If so, and if there's a way for JFBConnect to 'know' that that stream item is a video, or image, or whatever, we should be able to help you setup an Open Graph Action for it.
I hope that helps explain, but definitely let me know if you have any other questions or issues.
Thanks,
Alex