We are building a mobile AR App in Unity in which we need to display geo-tagged data in the camera view.Wikitude looked like the solution, but does not support geo-tagging in their Unity Plug in.
There has a plugin in the asset store called GO Map that can convert GPS coordinates to Unity world coordinates.
You can read the documentation of this asset here: https://docs.google.com/document/d/1AkbzO-xJHD8IXFJNJsmM-n1zgmFhYHwa_-WSpsjwFwk/edit
See the section "Location Manager".
I hope that this info are useful for you.