The documentation says that the sequoia camera uses the PTP protocol over USB. There don't seem to be any ROS nodes that support this, so you would have to make your own node to interface to this.

There are some open source libraries that implement the PTP protocol you could use as a starting point like this. Then you'd just need to make a ROS node to take and download pictures. This is not trivial but looks like the way to get this working.

Hope this doesn't put you off.