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If we want to have the blurring effect like the Portrait mode in the iOS Camera app. What do we do? This source can do the same thing as Portrait mode, like:

• Blurring the background behind the object

The original image:

The blurring image:

• https://developer.apple.com/documentation/avfoundation/cameras_and_media_capture/capturing_photos_with_depth

• https://devstreaming-cdn.apple.com/videos/wwdc/2017/508wdyl5rm2jy9z8/508/508_image_editing_with_depth.pdf?dl=1

• https://stackoverflow.com/a/49308754