The Xbox 360 Kinect is often mistaken for a video camera, but it doesn’t record video in the traditional sense—there’s no built-in feature to save MP4 files to your hard drive. Instead, its primary sensors are an infrared depth camera and a VGA (640×480) RGB camera, designed for real-time interaction rather than capture.
If you need actual video recording, you’ll need a separate USB webcam or a capture card. The Kinect was built as an input device, not a camcorder.