Good news! As of 5th of May 2015, you can now zoom in on Snapchat. It comes on an update package and you just need to install it. A little late, but as they say, better late than never. The feature of pinch the screen to zoom in the Samsung or the Apple iPhone camera is now available in Snapchat. So simply pinch out to zoom in. For video, you can actually zoom in and start recording, or even zoom in and out on the air. Just make sure your Snapchat is properly updated if you can’t use the function. So far, it seems to work perfectly on all Samsung products, and the iPhone 5s and up.
Unfortunately, this feature doesn’t work on the iPhone 4s and below. You can’t zoom in on Snapchat those models. Apparently the development team only make it work for the later version of the camera in the iPhone line. Be patient I guess, then again it’s been a few months now with no news that they will fix it. So don’t keep your hopes up.