only detect in a section of camera preview layer, iOS, Swift

I am trying to get a detection zone in a live preview on my camera preview layer.

Is it possible for this, say there is a live feed and you have face detect on and as you look around it will only put a box around the face in a certain area for example a rectangle in the centre of the screen. all other faces in the preview that are outside of the rectangle don't get detected?

Im using Vision, iOS, Swift.

Copyright Notice：Content Author:「Tony Merritt」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/46098760/only-detect-in-a-section-of-camera-preview-layer-ios-swift

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