/usr/lib/x86_64-linux-gnu/libXv.so is in libxv-dev 2:1.0.10-1+deb8u1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libXv.so.1.0.0
/usr/lib/x86_64-linux-gnu/libXv.so.1.0.0