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The package documentation says
Output frame (string) -- The name of the frame that the published Cartesian locations of the AR tags will be relative to
So you should use the frame of the camera as output frame for alvar.
In my project I use
<arg name="output_frame" value="/camera" />
because my image gets published to
<param name="frame_id" type="string" value="camera" />
(I'm using the uvc_camera package for my cam.)