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Hello again,
(Also see my answer on http://answers.ros.org/question/209229/problem-building-ar_kinect/ ) In their default mode, AR tag detecting packages only need camera_info and image_raw / rect topics to localize the AR tag, which means that uvc_camera may be replaced by just about any camera driver. Try searching for drivers supported on Indigo (I think camera_umd is one such driver), or gscam perhaps. Instead of calling uvc_camera from your launch file, call this camera driver and remap topic accordingly.
If you have a kinect, again, ar_track_alvar is a good option - there is an additional feature for using a kinect's depth to improve accuracy of the detection (complete with it's own launch file). This is a more plug-and-play solution.
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