Is the ZED backward-compatible with USB 2.0?

Yes. The ZED stereo camera is a UVC-compliant SuperSpeed USB 3.0 camera that is also backward compatible with USB 2.0 host ports and does not require any special camera drivers.

When connected with USB 2.0, the ZED will downgrade the video signal and framerate but will continue to output 3D HD720 at 4 FPS and VGA resolution video at 12 FPS.