/usr/bin/gvimtutor is in vim-gui-common 2:7.4.488-7+deb8u3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | #!/bin/sh
# Start GUI Vim on a copy of the tutor file.
# Usage: gvimtutor [xx]
# See vimtutor for usage.
exec `dirname $0`/vimtutor -g "$@"
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