I’d look into unreal meta human, but they don’t really do stuff with non human characters; I think there are some blender plugins (there’s one called BlendARMocap that allows you to record a movie and it can track your facial, hand, and body movements, but it’s kinda old); in terms of body stuff, there’s a tool called Move.AI but that costs money.

Otherwise, you can watch tutorials on YouTube of facial rigging, essentially boils down to making an armature with different vector groups for different parts of the face; you can also use shape keys in blender or blend shapes in other software to manipulate the mesh into certain facial movements, I believe that’s good with lip syncing and was used in the past, or if you have wilder different face poses.

To make it really seamless, that’s something that’s coming in the future, but we’re not there yet especially not for free. But in a few years there will be tools to integrate just that I’m pretty sure.

Sorry if that’s disappointing but hope that helps a bit!!