Camphor tree or Camphor Laurel - Cinnamomum camphora, is a tree originally native to southern China and southern Japan. It has shown up in occasional Japanese bonsai shows. The leaves are large, glossy and attractive. The leaves are larger than what is usually considered ideal for bonsai, but the other attributes of the tree are good enough that despite the leaves, they have been used as bonsai in Japan. The fragrance of the crushed leaves is part of their attraction, and the interesting rough textured, reddish brown bark. Their small white flowers and small black berries are also a features that are desirable.
They are subtropical, and will not tolerate much in the way of cold. I do not know how frost tolerant they are. They will not survive a Chicago winter. I think zone 8a is as cold as they would tolerate.
All in all, a nice stump you got there, treat it like any other deciduous, or broad leaf evergreen you would use for bonsai.