You can try the following solution:

　　1. The camera lens is covered by dust or film.

　　2. Poor lighting conditions when using the camera.

　　3. Driver is not installed, or incorrect driver is installed.

　　1. If so, try to remove dust or film from the camera lens.

　　Tip: like the camera lens, the camera needs to have good transparency. Dust and film will affect the imaging effect.

　　2. Please try to adjust the distance between the subject and the camera, as well as the light of the external environment.

　　Tip: the camera lens of the notebook can't rotate generally, so the distance between the camera and the camera needs to be adjusted. If the external camera can adjust the focal length, and the light of the surrounding environment of the photographed person also has a great impact on the definition, please adjust it as needed.