I encountered the same problem with a built-in camera on my laptop
running 17.04. I needed to add both of the following lines to
/etc/apparmor.d/abstractions/libvirt-qemu

/dev/bus/usb/001/003 rw,
/run/udev/data/** r,

In my case, the camera is USB device 1-3.

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https://bugs.launchpad.net/bugs/1515791

Title:
  USB passthrough - virt-aa-helper must grant /run/udev/data/ r

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