Video in Motion and which OBDII software/hardware to buy

Has anyone worked out how to activate Video in Motion yet?
I have been able to activate this feature on all my previous vehicles by doing a quick hack via OBDII to increase the speed at which the video playback turns off (only so my passenger and kids in the back can watch videos when on a journey you understand!!). I mean… whats the point of being able to play videos on the infotainment screen only when stationary??
I know some hacks for this involve disconnecting a cable from the back of the head unit which signals that the car is in park but as the video on the MG ZS will keep playing below a few miles per hour, I assume it is related to speed data on the bus like on VAG vehicles for example.
Any info greatly appreciated.