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There is, but it's not pretty at the moment :(

Basically, unless specific support in OpenStack is added for manipulating video devices, you have to go into the libvirt.xml file and manually modify it.

I'd recommend posting about your needs on the openstack mailing list (https://wiki.openstack.org/wiki/Mailing_Lists#General_List ) so they can be captured and we can make a better story.