/usr/lib/x86_64-linux-gnu/libIntelXvMC.so.1 is in xserver-xorg-video-intel 2:2.99.917+git20171229-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libIntelXvMC.so.1.0.0
/usr/lib/x86_64-linux-gnu/libIntelXvMC.so.1.0.0