Change Camera in Quicktime with Applescript

Hey all,
I’m writing a script to record video using quicktime player. I’ve got everything working for the most part. The only thing I can’t figure out is how to change the camera. I’d like to use a camera other than the built in iSight. I am able to select the camera manually when working in quicktime from the dropdown menu to the right of the record button, I just don’t know how to automate this.

Any help would be appreciated. Thanks!