AVCaptureSession是一种用于捕捉和处理视频数据的类。

简介：
The requirement for the custom camera within the AVCaptureSession is to capture bank cards and both the front and back sides of identification cards. However, the iOS system’s camera produces square images after capturing, exhibiting compression artifacts. Consequently, there’s a need to achieve proportional capture with identification cards, mirroring the functionality demonstrated in the provided example, and supporting seamless switching between the front and rear cameras.