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Introduce libavdevice to make v4l2 available to the ffmpeg backend * introduce libavdevice to make v4l2 available to the ffmpeg backend * downgrade the min required libavdevice version to 53.2.0 * make libavdevice optional * create OCV_OPTION OPENCV_FFMPEG_ENABLE_LIBAVDEVICE and add definition through ocv_add_external_target * move OCV_OPTION 'OPENCV_FFMPEG_ENABLE_LIBAVDEVICE' to detect_ffmpeg.cmake