This tutorial covers the process of creating a MetaHuman using a custom mesh. It also demonstrates how to use the MetaHuman Markerless Motion Capture plugin to capture motion from video footage and apply it to a MetaHuman character.
https://dev.epicgames.com/community/learning/tutorials/7xOJ9/unreal-engine-fab-custom-metahuman-modification-by-using-custom-mesh-markerless-motion-capture-based-on-video-in-finnish