Snapchat One-handed Zoom: One-handed zoom is a great Snapchat feature that you will definitely want to look into. All you have to do is drag your finger up and away from the capture button while recording. Simply dragging up from the capture button allows you to zoom in when you are taking a picture or recording a video.
Snapchat One-handed Zoom feature is incredibly useful for those who use Snapchat a lot and want the ability to zoom in on the subject of their photo or video quickly with just one hand. This zoom feature works both ways, so you can zoom out by dragging in the opposite direction. The very best thing about this is that there is no pinch motion required, as it is a much easier way to go about zooming in and out.
You do not need to jailbreak your device to use this feature, as it is built into the official Snapchat app. Those who want the ability to quickly and easily zoom in and out when they are taking photos and recording videos to send to others on this app will find this to be a huge convenience and very easy to do, even if you have never used Snapchat before.
You may also be interested in reading this: Save Snaps Secretly and Spoof Location on Snapchat for iOS and if you have a jailbroken device this: Phantom for Snapchat.