No credits in the video or on youtube as a whole but they do link back to their website where people can see the originals in all their glory with full credits, & while it's true you could remove your picture from the site there's nothing stopping them putting it right back as you gave them permission to use it as they see fit by giving it to them.

It stinks but I don't think they've done anything wrong in the eyes of the law.

ps I never saw the video on their site.

Windows 7 64Bit
Poser Pro 2010 SR1