[maury91]

You can visualize it easily if you think about your own vision.

If you put an hand in from of your face ( without covering your eyes ) you will be able to see behind it even if both eyes see only a part of what is behind your hand.

Now regarding the video imagine that each pixel is an eye, and they are spreaded evenly along a circle.

There are a lot of differences between this example and what he actually did, but it should be very easy to visualize ( main difference I can think of is how much amplification he needed to do so each eye is almost blind )