Does anyone know which driver I could install to use a PrecisionHD 1080p 4x as a webcam? Windows detects it as an USB video camera but I can't get the video stream from it. I know it's probably an unsupported feature, but maybe someone has a clue!?
These cameras don't support video over the USB - you need to get it via the HDMI port on the camera (with a suitable HDMI capture device). If you want PTZ control, then you'll need to use a serial connection and VISCA commands.
Thomas the 4X camera does have an HDMI out - take a look at page 7 of the camera guide:
As for when any other functionality will come from this, I would not expect anything new. This camera was used primarily with the SX20 which has been obsolete for a while (end of sale was over a year ago).
There is no HDMI port on this camera, only USB.
Are you able to confirm the model of the camera then? The PrecisionHD 1080p 4x camera (as linked in @Patrick McCarthy's post) has HDMI. Perhaps you are referring to a different camera? Perhaps the PrecisionHD USB Camera? If it's one of those, they're now an end of support device too.