All those "gifs" I made myself that I respond with. Those are ai motioncapture. I actually stood in front of my camera and recorded myself doing those actions first, then I applied them to my avatar.
I could do some of those for you and you can set them up in like a loop to run while you're speaking over your stream.
Just sent me a video of the expressions you want and I can use your PFP, or whatever picture you want for your avatar.