The Integrated camera
Almost all recent ThinkPads have an integrated camera above the display. This camera (typically called a webcam) is USB attached. On some earlier ThinkPads it used a proprietary camera, but later models use a standard UVC camera which is supported by the uvcvideo driver.
ThinkPads which may have a proprietary camera
Sonix sn9c201 supported by the gspca_sn9c20x driver
ThinkPads which may have a UVC camera
1.3MP fixed focus