Transparent sphere making objects invisible/transparent

I was just playing the Beta of Divinity Original Sin and it seems to me that there is a transparent sphere floating in front of the camera that makes everything invisible/transparent that passes through it. This way objects blocking your view on the hero become invisible.

Is it possible to create such a sphere in Unity, too? Maybe someone has already tried it and has idea how to do it?

I played around with some scripts that make walls or objects transparent once they are in front of the camera, but the effect in Divinity looks much cooler.

 

Just use raycast from camera to player and if there is any object - change its material to something like particle addictive.