If your CD isn't split track, I wouldn't try to take out the vocals.

What those programs do (as far as I know) is remove frequencies that are common with the human voice.

It would be like taking out certain keys on a piano. The piano needs those keys (when played) to sound full.

Another way you could record audio to your camera is to assign your signal to an "aux" output, In your aux section of the mixer, you'd turn up what you'd like to go to your camera on the individual channels.

I'd go this route for a few reasons. Mostly though, it woudl allow you to get a more specific mix. If you were to run a "line (or tape) out" from your console, you have no control over you mix as this is just a copy of is being sent to your speakers. Using your aux section is like having a seperate smaller mixer which'll give you greater control over what you want and don't want to be sent to your camera.