In the industry, that’s known as face (or facial) detection, which is a different problem than face recognition.
Face recognition means computing which individual from some other database of people a particular face belongs to.
There’s also face tracking — detecting a face in an image and then tracking the same face across subsequent images. Which is often implemented by using a face recognition approach, but without any predefined catalog of people — you just dynamically fill up your face database as faces appear in the image sequence / video source.
'Face detection' means it can detect faces. 'Face recognition' means it recognizes the faces. A specific example of the difference: license plate detection will detect the presence of a license plate; license plate recognition will tell you the number on that plate.