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As just described, (hybrid) GeoH tracking can be used to convert motion capture data to joint angles. But GeoH tracking can also be used as a direct alternative to motion capture, to track secondary motions (deformations) upon the primary mesh, as long as those secondary motions have limited degrees of freedom.
Here's a quick comparison of different tracking types.
Motion Capture. Multiple pre-calibrated cameras with known FOVs. Individual features being tracked can move arbitrarily and completely independently, producing an animated point cloud (to which object locations can be fitted).
GeoH Tracking. Single camera with known FOV. There must be an excellent existing 3D mesh for the object(s) being tracked. Secondary tracking for sub-objects such as jaws, arms, hands, car doors, etc maintains exact defined relationships between the child and parent objects. The limited degrees of motion between the child and parents makes extracting more information possible from the single camera view.
Regular Object Tracking. Single camera with potentially unknown FOV. Does not require a pre-existing mesh. If there are multiple objects or subobjects, they must be tracked separately, and there is no specific relationship maintained between them. (It's crucial to get the scaling right for each one.)
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