MetaHuman Animator now supports real-time facial animation, enabling users to generate high-fidelity facial animation as it is performed. This new technology uses GPU/NPU processing without the need for depth data, opening access to a wide range of capture devices. It even works from audio.
https://dev.epicgames.com/community/learning/tutorials/8XGY/unreal-engine-metahuman-real-time-facial-animation-from-single-camera-test-with-webcam-subtitled