/usr/lib/x86_64-linux-gnu/libQt5MultimediaQuick_p.so.5 is in libqt5multimediaquick-p5 5.9.5-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libQt5MultimediaQuick_p.so.5.9.5