The need of thinking together the webcam and apps sounds reasonable.
It doesn't matter for the users if it is Mercury or other ones (by qt4 ?), the point is getting communication + audio + webcam. The question is up to the programmers.
Keep an eye on the requirementlist, without thinking about hand in hand a bounty for a webcam driver and application is pretty useless unless you want a digital mirror... Like Warpcafe wrote:
http://en.wikipedia.org/wiki/MirrorThink very well about it that we have multiple messanger protocols like America Online (still around ?), Yahoo Messenger, ICQ, MSN. I'm did not do research to find an application that could support these mayor chat protocols, is cross platform (so hopefully easy portable to Os/2) and would support webcams as well.
Something to realy consider is that such a client in some cases requires maintance. Then its better to take for example a platform neutral client as Mercury messanger (for MSN).
It would not be good old Microsoft again if they would not modify the MSN protocol. Look on
http://mercury.im/At the top of the page: "You are logged out because there was a problem with the connection with the MSN server' bug just after signin. Mercury 1.9.5 and Mercury 2.0 RC1 have been released to fix this."
Thats an example of needing somebody todo maintainance on the client.
Roderick