Only the original launch model (2013) included a camera—the Kinect 2.0 sensor. It was bundled initially, then sold separately.
Model Breakdown
Xbox One (Original, "VCR"): Proprietary Kinect port on rear. Kinect 2.0 included in Day One bundles; later sold separately.
Xbox One S (2016):No Kinect port. Requires a USB adapter (discontinued, rare/expensive) to use Kinect.
Xbox One X (2017):No Kinect port. Same USB adapter requirement.
Xbox Series X|S: No Kinect support at all.
Current Options for Camera Use
Standard USB Webcam: Plug into any USB 3.0 port. Works for Mixer/Twitch streaming (via Twitch app), Skype, and Microsoft Edge. Does not support Kinect features (IR tracking, voice commands, Kinect games).
Kinect + Adapter (Legacy): Only on original Xbox One or S/X with the adapter. Microsoft ended Kinect production in 2017.
For streaming, a Logitech C920/C922 or Razer Kiyo via USB is the practical modern solution.