How to adjust the camera overlayview size

i am making a photography app and need to overlay an image over the camera. i am wondering if there is a way to adjust the size of this image because it's going to full screen by default.
currently, i'm solely displaying the overlay picture using the code:
picker.cameraOverlayView = cameraCase;
where the "cameraCase" is a uiimageview that is being overlayed on top of the camera and "picker" is the uiimagepicker.
i would also need to add buttons (of custom sizes) on top of the camera view as well - i'm assuming i can adjust the size of these as i would a picture.
any knowledge you're willing to share would be much appreciated!
many thanks in advance!

that that wasn't really the correct answer - anyone got anything?

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How to adjust the camera overlayview size

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