COLOR_ELEM         77 modules/videoio/src/cap_gstreamer.cpp #define COLOR_ELEM "ffmpegcolorspace"
COLOR_ELEM         79 modules/videoio/src/cap_gstreamer.cpp #define COLOR_ELEM "videoconvert"
COLOR_ELEM         81 modules/videoio/src/cap_gstreamer.cpp #define COLOR_ELEM "autovideoconvert"