Question on how this is completed

Hi everyone, I have seen this streamer putting his eye and mouth over a model (in this case a peanut) i was just wondering if anyone knew how this was done? I’d like to recreate it on a vsseeface model but assume some after effects are done to it. I am curious if anyone would know what these after effects could be or what software could be being used? I appreciate any advice given. Thank you.