Im just messing with you, I don't really care if you copied Rfifan or not.
Overlaying two videos would be very difficult because the camera position would have to be exactly the same for both recordings, which is essentially impossible to achieve consistently.
We did have a script that overlaid a ruler on the ground along the Y axis, but it doesn't work anymore (seems to be incompatible with newer versions of TB).
I can imagine a script that would tell the Y position value of the furthest body part. But unless a scripter wants to lend their efforts to this, we'll keep measuring distance records with engage distance, using Uke's position as the reference.