The normal camera streaming functionality is already unrelated to the Pixhawk, and QGroundControl is just a receiver.
Given this:
I expect it should be possible to use the exploreHD the same way as any other H264 camera, which could either be done using our Companion software, or just setting up a gstreamer pipeline (if you only want the video stream).
This comment covers how the camera stream is set up in the existing Companion software (including a link to the gstreamer pipeline we use), as well as some ways of receiving a stream outside of QGroundControl.