I found the video for it, it might be on github actually. If I get the chance ill dig around some more and see. I think it might be a part of Nebu.
Update
Here is the base script for it. You can probably convert this to serve your needs.
This is how it was used:
Hi @Pryme8 and thank your for this hint, i might have a look onto it when i re-address this topic.
Currently im quite satisfied with the controller i already have (although still no physics is involved).
For anyone intrested, have a look at my current Demo: Project JS_Zero
or the repo for details: GitHub - to5ta/js_zero: Mediveal RPG Online Game Prototype
And let me know what you think.
I am working on getting the babylon toolkit to be a Library First Runtime Library (Does not require the actual UnityExporter… The exporter is more focused on content creation… creating interactive GLTF scene files)
Ill drop you line when i get my Unity Like Character Controller working using Animation State machine Unity Like Mechanim Animation system… Wroks great when they work together…
UNITY.CharacterController and UNITY.AnimationState from the Babylon Toolkit make using character just as easy peasy as in Unity
Here is the small example - Babylon.js Physics Fun
Right click makes some magic 
still trying to find the playground that I did a long time ago where you can pick up boxes with different masses, and there is a blow gun and ramps etc. That one had a lot of goodies in it, but I can not find it now.
Here is one of the older versions of it, you have to turn your bjs version down to 4.2 for it to work.
It does not have all the bells and whistles of the new ones I did but its got some interactions and cool things to learn from.
New Havok Physics Update
Check this out:
Unity Interactive Content - Character Controller Demo Playground