powerbank 12v to kinect sensor v2
has between 9 and 12V output


It's not that easy. To get power from that bank, you need to speak the USB-C PD protocol. Otherwise, you'd only be getting "normal" VUSB of 5V at low current capability.

That's a pretty complicated protocol, and requires you to afterwards handle quite a bit of power, so that's why you'd typically do that by buying a special chip to talk to the power source.

Frankly, considering the level of understanding for electrical units, this is probably nothing you'll achieve on your own. You'd be better off just buying a cheaper 5V power bank and buying a (good) 5V -> 12V step up converter.