The RPi camera is not a webcam. Chromium does not recognize it as a webcam.
But with additional software it can be done.
I haven't done it, but this
looks like a good tutorial.
: The All-In-1 GUI Tool for Raspbian Images & SD Cards.
in a VM, Flash directly from the Internet
, and much more.
PS. Want to download an Img ASAP? PPT's Download
mode is 2x as fast as Chromium.