For an avatar
I can make animated avatars for this forum up to 5 seconds long now but they have to be smaller than 120x120 and they will probably work, I can't guarantee every avatar will work but it is worth a try. Post the actual video you want it from,not a link and I will try my best
For a banner
Post a link/links to a photo/photos and give a detailed description of the size colours and style you want.
For a userbar
Tell me 2 colours and what you want it to say.