In /etc/udev/rules.d, create a file called 10-local.rules if there
isn't one already. Then create a rule:
KERNEL=="ttyACM*", NAME="%k", MODE="0666", OPTIONS="last_rule"
This will override the line from 50-udev.rules:
KERNEL=="tty[A-Z]*", NAME="%k", GROUP="uucp", MODE="0660"
In the case of /dev/vedio0, it should already be set correctly by
console.perms. The lines that take care of this are:
<v4l>=/dev/video* /dev/radio* /dev/winradio* /dev/vtx* /dev/vbi* \
/dev/video/*
and
<console> 0600 <v4l> 0600 root
Mikkel