The NUI Motor (Natural User Interface Motor) is a part of the Kinect for Windows ecosystem, specifically related to the Kinect for Windows SDK. It refers to the motor control driver for the Kinect sensor's tilt mechanism. The Kinect sensor has a motorized tilt feature that allows the device to physically adjust its angle up and down to better track the user or optimize the sensor's view of the environment. The NUI Motor driver enables control of this tilt motor.
If you are using the Kinect sensor (specifically for Kinect for Windows v1 or v2), the NUI Motor driver is a component of the broader Kinect SDK and runtime, and it is installed automatically as part of the SDK package. Here's a breakdown of what it is and how to install it: