Before we can get down to the nitty-gritty of our gesture recognition algorithm, we need to make sure that we can access the depth sensor and display a stream of depth frames. In this section, we will cover the following things that will help us set up the app: 

• Accessing the Kinect 3D sensor
• Utilizing OpenNI-compatible sensors
• Running the app and main function routine

First, we will look at how to use the Kinect 3D sensor.