shader that conceals objects behind camera footage (similar to the Blender Holdout Shader)

Hiho Unity Community,
i'm very new to unity, but i have an actual problem where i need a shader that is not visible but conceal objects behind this concealer object. I come from the blender world and there is a so called holdout shader that renders the object which it is attached to and everything behind it transparent.
In unity i don't even know what to search for. maybe the gif helps to understand it.

https://imgur.com/uuqmpl7
The red object isn't visible, and it hides everything behind it.
Every tip would be good. Maybe just a keyword will help, so i can search the forum for it.

Thank you in advance and a happy weekend.
SeppSowas

 

What you're looking for is called a Depth Mask. See here for example.

 

Yeah, exactly what i'm looking for! Thank you very much.