Piggy backing on this, image sensors using CSI are quite common. I don't know if anyone has this application, but theoretically if you wanted more than a few (I think even higher end processors cap out at 4) video streams in comes.... FPGAs. Maybe the newer Qualcomm XR chipsets can deal with that but an FPGA seems more attainable.
Qualcomm has supported CSI virtual channels for ages - you can get a little 4:1 bridge IC to renumber streams. IIRC, the 855 had 4 CSI IFEs, and would happily handle a 16x configuration if you bought the wide memory bus.
