Multicam support in iOS 13 allows simultaneous capture

In iOS 13, Apple is introducing multi-cam support allowing apps to simultaneously capture photos, video, audio, metadata, and depth from multiple microphones and cameras on a single iPhone or iPad.

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Apple has long supported multi-camera capture on macOS since OS X Lion, but up until now, hardware limitations prevented it from rolling out APIs for iPhones and iPads.

The new feature and APIs in iOS 13 will allow developers to offer apps that stream video, photos, or audio, for example, from the front-facing camera and rear cameras at the same time.

iOS 13 Multi-cam support w/ AVCapture 

At its presentation of the new feature during WWDC, Apple demoed a picture-in-picture video recording app that recorded the user from the front-facing camera while simultaneously recording from the main camera.