Like my Galaxy S III ... from 2 1/2 years ago.
I recently had an iPhone 5 for a couple of months ... nice piece of hardware ... apps work well ... iTunes is a pain in the rump ... people who rant and rave and get personally emotional about the supposed superiority of one platform over the other have their heads up their butts.
You could always do that on an iPhone. . . but nowhere near as fast as a 64bit processor iPhone 6 can do it. . . and your Galaxy SIII can not do it anywhere nearly as fast or as well. Read the contemporaneous reviews of that phone from 2 1/2 years ago. . . and read the reviews of its decedents now and see how slow they are to focus and take a picture compared to any iPhone. Sorry. . . that was the point of this article.