I have a videoPreviewLayer that takes up the entire screen.
The AVCaptureSession() has an AVCaptureVideoDataOutput() that records video and provides access to video frames for processing and a AVCapturePhotoOutput() that gives a capture output for still image, Live Photos, and other photography workflows.

The func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) gives an image upon capture which is easy to work with.
But the func captureOutput(_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) returns frames of sampleBuffer type that I need to crop from the center as a square. And I need this output in CVImageBuffer format(input to a CoreML model)

Basically I need center cropped sampleBuffer frames to work with while displaying the videoPreviewLayer that takes up the entire screen.

I tried helper functions to crop CVImageBuffer but have no way of confirming if its indeed center cropped.