I haven't tried it myself (I made my own bare metal uvc device to avoid using linux) but google and the list archives is your friend, as much as anything.
http://lists.berlios.de/pipermail/linux-uvc-devel/2011-February/006277.html
There's sample code availble in the distro already, as long as your linux is new enough.

Andrew

On 28/07/2011 10:58 AM, chao xie wrote:
hi
  My develop board have usb and camera sensor supported. I want to
  simulate my board to be a usb camera for the Linux host. I find that
  the f_uvc is supported in current kernel, but i am confused about how
  to make use of the video device exported by webcam. How can i do to
  simulate the board as a usb camera device? Is there any sample i can
  reference to? Thanks.
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