/usr/ is in libavdevice-dev 7:2.8.6-1ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/libavdevice-ffmpeg.pc
/usr/lib/x86_64-linux-gnu/libavdevice-ffmpeg.a
/usr/include/
/usr/include/x86_64-linux-gnu/
/usr/include/x86_64-linux-gnu/libavdevice/
/usr/include/x86_64-linux-gnu/libavdevice/avdevice.h
/usr/include/x86_64-linux-gnu/libavdevice/version.h
/usr/share/
/usr/share/doc/
/usr/share/doc/libavdevice-dev/
/usr/share/doc/libavdevice-dev/copyright
/usr/lib/x86_64-linux-gnu/pkgconfig/libavdevice.pc
/usr/lib/x86_64-linux-gnu/libavdevice.a
/usr/lib/x86_64-linux-gnu/libavdevice-ffmpeg.so
/usr/lib/x86_64-linux-gnu/libavdevice.so
/usr/share/doc/libavdevice-dev/changelog.Debian.gz