Just found this on google, hope it helps :) - http://www.planetwolfenstein.com/tramdesign/tutorials/tut_rtcw2avi.html
RTCW SP Demo Recording
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4 Jul 2013, 21:52
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Journals
Is it possible somehow? Tried googling aroung but didn't find anything. When I try to record I get this message:

And nothing happens if I change that cvar to 1.

And nothing happens if I change that cvar to 1.
3


Found it aswell, doesn't help :L

use fraps to record SP, don't think there is an option to record demos.