The document provides instructions on how to add the OpenCV library to an Android NDK project. It discusses downloading OpenCV and the NDK tools, modifying CMake files and OpenCV source code to support the target Android version, and building OpenCV and sample applications. Key steps include setting paths to the SDK and NDK, copying header files and libraries, modifying compiler options, and executing CMake scripts to generate Makefiles for building OpenCV and applications using native C/C++ code.