The Camcord socket is a local socket only and doesn't get distributed - I had the same probelm when I hooked up my IPOD into it and wanted to distribute the sound and picture.
Because there are only two available scart sockets on the back of the avant the only option (I think) is to get an AV2 expander and plug DVD1 into one and airport in the other.
I did this and it works fine - although I don't have a DVD1 but a Panasonic DVD so was able to use an autoswitching Scart selector instead.
Hope this helps.
Beovision Avant 32 RF, DVD1, Beovision 1, MX4002, Beound 3000, Beolab Penta MKII, Beovox Penta, Beolit 707, Beolink Passive, Beovox C30, Beocom 4, Beogram TX, 4 x Beo4, Form 1 & 2, Beocenter 7700, Beovox S65,