There’s an error on startup:
I updated the Project here
You have a typo in the chunk name
material.chunks.opacityTexPS = this.chromaKeyShader.resource;
Should be
material.chunks.opacityPS = this.chromaKeyShader.resource;
Yes, sorry, this is a bit text error that i deleted. However the project not work still 
It worked for me here: https://playcanvas.com/project/1059455/overview/f-chamera-chroma
Yes, i think i was using a objects withot good green intensity. Thanks, is working