Hey!
So in another thread, @Deim pointed out that real-time environmental reflections from the camera feed were provided by the Babylon SDK, as detailled in the git page.
Little typo spotted in the docs: I guess the declared const should be “envMap” to match the following code snippets 
Also I think the camera.updateFrame(); line has gone missing here before the env update (actually envMap now ), especially if the order matters:
Unfortunately it doesn’t work here 
I created a simple sphere attached to the face in the default Face Tracker template, and assigned it a basic reflective PBR material:
const sphereMat = new BABYLON.PBRMetallicRoughnessMaterial('sphereMat', scene);
sphereMat.metallic = 1.;
sphereMat.roughness = 0.;
const envMap = new ZapparBabylon.CameraEnvironmentMap(camera, engine);
scene.environmentTexture = envMap.environmentMap;
//scene.environmentTexture = new BABYLON.CubeTexture("./assets/hdr/environment.env", scene);
//sphereMat.environmentTexture = envMap.environmentMap;
const sphere = BABYLON.MeshBuilder.CreateSphere("sphere", {}, scene);
sphere.material = sphereMat;
sphere.parent = trackerTransformNode;
window.addEventListener('resize', () => {
engine.resize();
});
// Set up our render loop
engine.runRenderLoop(() => {
camera.updateFrame();
envMap.update();
scene.render();
});
And the sphere is shown plain black with a specular spot from the default hemisphere light.
If I rather assign a static cubemap to my scene.environmentTexture (= 1st commented line), everything works as expected though (= the sphere reflects the assigned static cubemap).
I tried also assigning the CameraEnvironmentMap to my custom material (sphereMap, cf 2nd commented line), both instead or in addition to the scene environment, but none works either.
Am I doing something wrong, or is this still being worked on?
Really excited to see this operational soon! 
Thomas