/usr/include/ is in libopencv-core-dev 2.4.8+dfsg1-2ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/opencv2/core/mat.hpp
/usr/include/opencv2/
/usr/include/opencv2/opencv_modules.hpp
/usr/include/opencv2/core/
/usr/include/opencv2/core/internal.hpp
/usr/include/opencv2/core/gpumat.hpp
/usr/include/opencv2/core/cuda_devptrs.hpp
/usr/include/opencv2/core/devmem2d.hpp
/usr/include/opencv2/core/wimage.hpp
/usr/include/opencv2/core/operations.hpp
/usr/include/opencv2/core/core_c.h
/usr/include/opencv2/core/eigen.hpp
/usr/include/opencv2/core/core.hpp
/usr/include/opencv2/core/opengl_interop_deprecated.hpp
/usr/include/opencv2/core/opengl_interop.hpp
/usr/include/opencv2/core/version.hpp
/usr/include/opencv2/core/types_c.h
/usr/include/opencv2/opencv.hpp