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Many times the problem is related to the order of the libraries:

LIBS += -lopencv_imgcodecs -lopencv_objdetect -lopencv_core -lopencv_highgui -lopencv_imgproc -lopencv_video
LIBS += -L$${_OPENCV_PATH_ANDROID}/sdk/native/3rdparty/libs/armeabi-v7a -ltbb

I need to put "-lopencv_objdetect" before "-lopencv_core"