/usr/share/doc/libvisp-tt-mi-dev/changelog.Debian.gz is in libvisp-tt-mi-dev 3.0.0-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libvisp-tt-mi-dev/../libvisp-core3.0/changelog.Debian.gz