You could install them the hard way.
# mount -o loop -t iso9660 dvd.iso /mnt/loop
# find /mnt/loop -iname '*wifi*'
# dpkg -i /long/path/to/deb/file/*file*.deb
# umount /mnt/loop
or something similar with mount for /dev/cdrom or /dev/sr0.
But most times it's just easier to setup a wired network connection and apt-get the packages. Or use something like dselect to create your apt sources as the distro supplied discs and use dselect to pull them from that location.
Broadcom wifi devices can be a bit of a hell to get working. But they can be made to work in most cases.