/usr/share/help/ko/gnome-help/figures/gnome-launching-applications.webm is in gnome-getting-started-docs-ko 3.18.2-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/help/ko/gnome-help/figures/../../../C/gnome-help/figures/gnome-launching-applications.webm