Creating custom taxonomy that utilizes site users (and avatars) as terms

I am using the custompress plugin to create a "video" post type. Videos on my site will be created by multiple users of the site, and I would like to be able to associate users and their avatars with different taxonomies to show credits of each video in the post (ie. director, actors, writer, etc.) Is this something that can be done with this plugin, or at all?

As examples, this type of functionality exists on FunnyOrDie and Vimeo