@REX_DUNGEUR can you give me any more information? I tried it in Chrome (on desktop and mobile) and it works fine. Can you try opening the console and seeing if it prints any more information?
edit: the problem is your playground is version 4.2.0. This one requires the 5.0 alpha. I will see what I can do about it.
Now this is impressive. It uses TensorFlow.js to overlay the GLTF pilot helmet over your own face.
My only complaint is that this means I was not the first person to combine Babylon with the face-landmarks-detection TensorFlow model.
Regardless, I think whoever did this did a good job. I already added it to my awesome-babylonjs.
TensorFlow.js PoseNet demo. Tracks the direction your face is turning. Made because TensorFlow just doesn’t want to track your eye position accurately.
I plan on combining it with the Ink demo at some point to paint by turning your head. https://playground.babylonjs.com/#N0CERB