/usr/include/opencv_apps/ is in libopencv-apps-dev 1.11.11+ds-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/opencv_apps/CamShiftConfig.h
/usr/include/opencv_apps/Circle.h
/usr/include/opencv_apps/CircleArray.h
/usr/include/opencv_apps/CircleArrayStamped.h
/usr/include/opencv_apps/Contour.h
/usr/include/opencv_apps/ContourArray.h
/usr/include/opencv_apps/ContourArrayStamped.h
/usr/include/opencv_apps/ContourMomentsConfig.h
/usr/include/opencv_apps/ConvexHullConfig.h
/usr/include/opencv_apps/EdgeDetectionConfig.h
/usr/include/opencv_apps/FBackFlowConfig.h
/usr/include/opencv_apps/Face.h
/usr/include/opencv_apps/FaceArray.h
/usr/include/opencv_apps/FaceArrayStamped.h
/usr/include/opencv_apps/FaceDetectionConfig.h
/usr/include/opencv_apps/FindContoursConfig.h
/usr/include/opencv_apps/Flow.h
/usr/include/opencv_apps/FlowArray.h
/usr/include/opencv_apps/FlowArrayStamped.h
/usr/include/opencv_apps/FlowStamped.h
/usr/include/opencv_apps/GeneralContoursConfig.h
/usr/include/opencv_apps/GoodfeatureTrackConfig.h
/usr/include/opencv_apps/HoughCirclesConfig.h
/usr/include/opencv_apps/HoughLinesConfig.h
/usr/include/opencv_apps/LKFlowConfig.h
/usr/include/opencv_apps/Line.h
/usr/include/opencv_apps/LineArray.h
/usr/include/opencv_apps/LineArrayStamped.h
/usr/include/opencv_apps/Moment.h
/usr/include/opencv_apps/MomentArray.h
/usr/include/opencv_apps/MomentArrayStamped.h
/usr/include/opencv_apps/PeopleDetectConfig.h
/usr/include/opencv_apps/PhaseCorrConfig.h
/usr/include/opencv_apps/Point2D.h
/usr/include/opencv_apps/Point2DArray.h
/usr/include/opencv_apps/Point2DArrayStamped.h
/usr/include/opencv_apps/Point2DStamped.h
/usr/include/opencv_apps/Rect.h
/usr/include/opencv_apps/RectArray.h
/usr/include/opencv_apps/RectArrayStamped.h
/usr/include/opencv_apps/RotatedRect.h
/usr/include/opencv_apps/RotatedRectArray.h
/usr/include/opencv_apps/RotatedRectArrayStamped.h
/usr/include/opencv_apps/RotatedRectStamped.h
/usr/include/opencv_apps/SegmentObjectsConfig.h
/usr/include/opencv_apps/SimpleFlowConfig.h
/usr/include/opencv_apps/Size.h
/usr/include/opencv_apps/WatershedSegmentationConfig.h