A very basic sample showing how to use the iOS camera with a custom overlay interface.
Based on the Official Apple Sample: https://developer.apple.com/library/ios/samplecode/PhotoPicker/Introduction/Intro.html#//apple_ref/doc/uid/DTS40010196
And using the solution from this Stackoverflow question: http://stackoverflow.com/questions/20502099/ios-monotouch-uiimagepickercontroller-multiple-photos-videos-from-camera