Why this is not done has been discussed many times. Let's keep it short.
These camcorders are not built to run for hours at a time. And if someone did issue a driver you might sue them when the camcorder dies in a few days.
A web cam is the cheap fix.
Bob
I recently purchased a Canon FS200 to record church services. It has worked well, including the external mic jack. However, it appears that this camcorder cannot transfer live video, like a webcam, to an online site such as Ustream. Are there any software recommendations that can convert the webcam? If not, are there other camcorders that do provide this feature? The camcorder would need to have an optical zoom. Thank you.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic