I've 3D tracked a camera in After Effects. It's a handheld camera POV walking in to an underpass that was probably in reality about 2.5m high. When I bring it in to Cinema the camera coordinates suggest that the camera is 10 metres above the ground plane and my human character is like a tiny pixie beneath it.
The easy thing is to resize the figure to make her something like 12 metres high but I feel I'd rather keep everything real-world size.
So I'm having trouble resizing the camera move. When I switch to animation mode the animation is scale from the camera's position and I can't seem to get it to scale from the ground plane level. Also, I would nest my figure inside a null created in After Effects at the position I want to place it, and i'm not sure how the scaling will affect all of this. Maybe there's a standard procedure to deal with all of this.
if tracked in C4D there is a vector constraint to establish the scale of the scene, I'm not experienced enough with imported tracks to know if that's possible so I'd try importing the track, scale the scene, then add your objects at the right scale.