What does it mean to write `static void * ptr = &ptr` in Objective-C

I am reading Apple's recently (Dec 5, 2013) updated sample code for camera control using AV Foundation (here is the link). And I come across the following lines in the file AVCamViewController.m which I don't understand.

static void * CapturingStillImageContext = &CapturingStillImageContext;
static void * RecordingContext = &RecordingContext;
static void * SessionRunningAndDeviceAuthorizedContext = &SessionRunningAndDeviceAuthorizedContext;

What does it mean to assign the pointer of itself? Why do we need this?

Update (2015-10-02): Now the AVCam is updated and rename to AVCam-iOS, if you are still insterest in this code AVCamViewController.m.