Is it possible to build a photo sharing site out of the box with ZenPhoto? I'd like to enable people to create an account and upload photos (and videos if possible) into their own albums. If not possible out of the box, is this possible to do with official or 3rd party plugins?

If you had read the message right below the post form you would know why your "message got cut off".............

For your purpose there is the register user plugin. You may need to modify your theme. Try a forum search as well on that topic.

Thanks