[Opserty]

You can do it, but you would be best setting it up so that each time a new video/picture is create a new thread is created, then you can just to that page thread from your site. You could also make a textbox on your page might be a little more work but it would be good I think.

I doubt there is a mod made for this, you could try searching. If you don't get any hits then this thread shows you how to create posts (and also threads)