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From the wiki page, section 2.3:

If you want to downsize the image while preserving the field of view, change one or multiple of the 'sensor_scaling' / 'binning' / 'subsampling' ROS parameters (e.g. set sensor_scaling=2 works in all uEye cameras that I've used).

If however you want to zoom digitally into a portion of the image, you can tweak the 'image_height', 'image_width', 'image_left', and 'image_right' ROS parameters.

Note that you can play with all of these parameters, and more, while running ueye_cam live, using dynamic_reconfigure.