I've done some more research, and it seems that existing components
   could do a substantial part of this project.  Consider the Vuze camera,
   specifically the Vuze+.    [1]https://vuze.camera/
   It has 8 cameras, in four pairs, aiming in the horizontal plane, and is
   able to use them to record stereoscopic views.
   [2]https://vuze.camera/camera/vuze-plus-camera
      This MIGHT be even better than I anticipated.  This device refers to
   recording data on SD cards.   Great, unless the device is smashed or
   stolen.  I consider it to be an essential part of this device that it
   port a substantial fraction of the data away from the cameraman,
   perhaps many tens of meters away.  But it mentions WiFi:  Does that
   mean that the entire data stream can be transmitted?   Even if the data
   can be only transmitted 'nearby', say 30-100 meters away, by WiFi, that
   would be a great feature.
   The specification sheet
   [3]https://images-na.ssl-images-amazon.com/images/I/91Hcr5ModJL.pdf
   mentions a data rate of 120 MB/second or 80MB/second.  Note that it's
   MB, meaning megaBYTE per second, not merely megabit/second.
   The specs say that the data is written to a SD card.  Can this be
   expanded using a 1 terabyte (or  larger) SSD?  Unclear.  The data is
   compressed to MP4.
   It also mentions:   WiFi IEEE 802.11b/g/n 2.4 GHZ
   I can tell, from:  [4]https://en.wikipedia.org/wiki/Wi-Fi     that
   WiFi4, 802.11n can do a link from:  "72-600 million bits per second".
   Already, I see a hitch:  Does this mean that this device can transmit
   80MB x 8 bits, or 640 megabits/second, since the link can only go to
   "600 million bits per second".
   While it would be nice to be able to transmit the entire data stream
   locally, as long as all that stream goes into a local SSD, I suppose it
   would be okay if "only" half the data, say 320 megabits/second, were
   transmitted by WiFi to another portable system carried by a different
   person a few tens of meters away.   But one question I have is this:
   Can the data stream be readily 'split up', so that only a portion of it
   is transmitted?  Or is it an 'all or nothing' sort of thing?
   And I think it's important that a smaller fraction of the data be
   transmitted by 4G or 5G cell data.
                            Jim Bell

References

   1. https://vuze.camera/
   2. https://vuze.camera/camera/vuze-plus-camera
   3. https://images-na.ssl-images-amazon.com/images/I/91Hcr5ModJL.pdf
   4. https://en.wikipedia.org/wiki/Wi-Fi