would it be safe to remove them?
I do not know, and wouldn't worry about them, but there's one way to find out: remove them and see what happens!
In case you get dumped at a command line login the next time you reboot, you might like to read this thread:
about getting a list of installed packages from the command line, and then reinstalling them on a different (though in your case it would be the same) machine, again from the command line. That way you can (probably!) easily restore the missing packages. You might want to do a
grep xserver-xorg-video packages.txt > xvideoPackages.to.reinstall
first or it may take some time to recover (if, indeed you find you need to). Have fun.