From the Hackster.io blog: The cameras are coordinated by four BeagleBone Blacks ,

From the @Hackster.io blog: The cameras are coordinated by four BeagleBone Blacks, and the results are fused together with an NVIDIA Jetson TX1, then passed to AWS for cloud processing
https://blog.hackster.io/quamera-uses-26-cameras-to-automatically-create-live-3d-environments-dea2594b0269