Help, I need to know how to create an app in real-time with openCV [closed]

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There are several sample applications and tutorials distributed with OpenCV4Android SDK. Start from Tutorial-1 application. It helps you to initialize OpenCV and get frames from camera. There are reference manual and some introduction tutorials for beginners. On Android you can use both Java and C++ API. Use Tutorial-3 app as an example of native calls. You can use any C++ functions available in desktop OpenCV except some parts of Highgui module related to window management. Video decoding and encoding are not supported also.