https://www.google.com/search?q=DMC-G6h&ie=utf-8&oe=utf-8#q=DMC-G6h+as+webcam

But in the manual I see it does have NTSC analog video so one might rig up the almost now forgotten video capture card to get that signal into your webcam app. That's been on the web for years so I won't duplicate that setup.

The other problem is these tend to overheat so I'd keep it down to about 10 or so minutes for the web cam use.
Bob