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We are developing an augmented reality (AR) game for iOS. In the game scene, we need to use both the iPhone Rear Camera and the Front Camera. In the case of Augmented Reality with the Rear Camera, we need to use the Front Camera to make video calls at the same time. In the process of application software development, we use the Rear Camera as ARCamera, and through the configuration ARWorldTrackingConfiguration class to create a ARSession instance, then use ARSCNView object to build the AR view shows, Augmented Reality with the Rear Camera we've done. But there was a problem. We couldn't get the video stream from the Front Camera at the same time. The question is: How do we make video calls with a Front Camera while having a Augmented Reality with the Rear Camera?We want the details of implementation.