Following up from an email:
Alex: InteractionBox was deprecated in a previous release, so it is very likely you're trying to use it with newer assets or a newer runtime.
Giannis: Is there a new way for changing parameters like the viewport box of the sensors or the sensitivity for recognized motion in a c# script? Is there a certain object of the assets which I should import into my scene?
You can't change the sensors' viewport box or sensitivity of motion, but you can write a script so that the hands don't render outside of a defined area.