What are the inputs for this clip because i cant find a guide on how to do it?

You need to tilt your right Joycon almost completely upside down, or your Pro Controller very left, a bit more than sideways. You'll know you've got it tilted enough when Mario leans to the left while driving on the scooter. Once you're doing that, just hit left on your movement analogue stick as you drive past the moon in the cage, there's no extra input, it's just timing and position.