The built-in desktop cameras in Macs are fixed focus, permanently mounted, single focal length devices. They do not pan or zoom.
In Macs, the individual software applications that you use for each particular camera function separately controls the camera. Therefore you will not find any systemwide averages that adjust the camera.
As a result, working only with what comes in the box of the Mac you bought, the only way to adjust the camera's field view is to move the Mac.
If you are willing to accept digital rather than optical camera adjustments, you can add third-party software like iGlasses. iGlasses lets you take manual control of some of the software functions (including digital pan and zoom) that normally automaticallyoperate Mac's camera.
Message was edited by: EZ Jim
Mac OSX 10.11.3