Build a mobile app

Hi geeks, I need to develop a native mobile app. It should target all mobile devices. Basically, i want my app to monitor the phone hardware for access. For example, if any app like watsapp accesses the camera. It should give me a prompt on the screen and ask me whether to allow it or not. I need to do it without rooting the device. I am open for suggestions from your side. Let me know, if you can do it. Thanks