Looking for some help on a project

Hey y’all, I’ve been seeing these clips everywhere of AI streamers, and I’ve been searching Everywhere for explanations of how to make one. I believe I understand the concepts, but I’m really at a loss for the avatar text to speech part. I believe I have it ready for collecting questions and getting it to ChatGPT for response/script, but im very stuck at using a photo for an avatar that can mouth the words and not take 3 mins per response. Any help is appreciated, I’ve been at this project for longer than I’d like lmao. The attached video is a random YouTube short for reference