In order for facial recognition to work, your camera needs to have the infrared feature. If it is just a regular camera, even if it is high definition, it will not support facial recognition.
You can go to your computer's manufacturer website, look up the specs for your specific model to see if your camera is an infrared (IR) one to verify your hardware eligibility.
If you need help verifying that, I can help you look it up. please type msinfo32.exe in the search on the taskbar and hit enter, then share a screenshot of the pop up please.