That's right, it's still not implemented. Our core team is dedicated to the development of the new release version of the system (KCeptor++, etc), and we plan to implement this feature after this part of the roadmap is complete.
In the meantime a group of collaborators started implementing a basic translation algorithm, but the project is still incomplete
You can take a look at a post I created summing up the requirements of this development
https://forum.chordata.cc/d/68-ground-animation/6
And in this other thread there is the discussion about the development while it was being implemented
https://forum.chordata.cc/d/101-blender-motion-capture-walking-jumping/14
If you want to give it a try it would be terrific.