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You should be able to use 2x2 binning or subsampling to accomplish that resolution reduction, according to Section 9.2 'Video Modes Overview' in http://www.ptgrey.com/support/downloads/10120/

This ros node looks to support it https://github.com/ros-drivers/pointgrey_camera_driver/blob/0bcd3c54320f7265069686801f441a3592e7f4c7/pointgrey_camera_driver/src/nodelet.cpp#L107, also this alternative with SetGigEImageBinningSettings https://github.com/KumarRobotics/flea3/blob/8c0d1ae7fef3d1544dd285869fac5711bdd0421e/flycapture/include/flycapture/GigECamera.h#L268

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