create dynamic camera overlay that changes with scences

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Hi I am new to IOS developing. I've been searching for a while, just can not find a good example.

I like to create an app dynamically detect paper, The app should be able to generate dynamic camera overlay by analysing current camera scenes.

like Adobe Scan. enter image description here

I can program the sampling and detection algorithm myself, but really not good on the IOS interface and technique.

I am using objective-C as programming language.

I like to know:

1, how to change the camera overlay in real time?

2, how should i put a ticker that repeatedly check camera scenes?

3, how can I access and modify a picture from iOS objective C?

Please give me some ideas or show me some examples.

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