Occasionally I’ll watch Sunday night NFL games on the NBCSports.com website. The NBCSports.com video player allows you to watch video full-screen. The problem is that even when watching full-screen, you’ve got wasted space to allow for the different camera angles that they offer.
NFL on NBC Video Player Window - Full-screen
Here’s two ways to increase the size of full-screen video using a built-in MacOS X shortcut.
Use your Scroll Wheel
If you have a mouse with a scroll wheel, hold in the control key and scroll toward the front of the mouse (as if you were scrolling up a page) to Zoom. To scroll out, simply hold the control key and scroll toward the back of the mouse (as if you were scrolling down a page).
No Scroll Wheel? No Problem
You can also use a keyboard command to achieve the same effect.
To Zoom-In on your screen use the following key combination:
Option Command = (equal or plus sign).

To Zoom-Out use the following key combination:
Option Command - (dash or minus).

NOTE - You cannot use the + or - on the numeric keypad to zoom in or out.