modules/videoio/src/cap_gstreamer.cpp:577:31: error: invalid suffix on literal; C++11 requires a space between literal and identifier [-Wreserved-user-defined-literal]
            filename = "v4lsrc ! "COLOR_ELEM" ! appsink";
                              ^
    modules/videoio/src/cap_gstreamer.cpp:585:32: error: invalid suffix on literal; C++11 requires a space between literal and identifier [-Wreserved-user-defined-literal]
            filename = "v4l2src ! "COLOR_ELEM" ! appsink";