Having searched for webcam drivers for the Sony CMR-PC2 without success, I finally found the original CD. Here are the drivers. As even the Sony Europe website does not provide these drivers, only the manual, I am proving a link to download the drivers for Sony CMR-PC2.
Download Drivers-Sony-CMR-PC2.zip (13MB)
I have no idea if these drivers also work for the CMR-PC3 or similar, perhaps you can let me know in the comments.