Chances are your cam is NTSC, and is therefore recording in NTSC. So the file you capture is in NTSC. In turn, your burned DVD will be in NTSC.
I am not sure if there is any program that can take NTSC footage and convert it to PAL, especially when PAL is a higher quality format (notice how NTSC cams are generally cheaper than PAL?) I havent personally seen it done, nor do I know if its possible. But it would be damn useful, looks like it. There seem to be a lot of people bying region 1 cams outside of region 1...