As far as I know there are two videos on Cyclocross training presently available
Cycle-Smart- Solutions for Cyclo-cross by Adam Hodges-Myerson (I haven't seen this one but intend to buy it. Adam is a sharp guy who knows what he's talking about.)
Martin Eadon the British National Cyclocross champ in 2003 or so made a very good training video that I have. I don't know where or if you can still buy them but I'd recomend it as well as the one from Adam.
And of course Simon Burney's excellent book: Cyclo-Cross Training & Technique