Hmmm, interesting question. ISRC codes are usually encoded into the track in the mastering phase. You can use Roxio Jam to encode them into audio tracks ...
i"m not sure if ripping the track and putting it on a DVD-Video would transfer the code or not!
I'd suggest calling your replicator and asking ... they should know more about this.
Aditionally, there are protocols for putting ISRC codes into music videos, but again I've never done it myself ... maybe somebody else cdan share their experiences with this?