split screen from two USB cameras

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Hi all

Really like OpenCV and admire what is possible. For start, would like to make make simple split screen (vertical split) from two usb cameras. I have old 16:9 monitor, rpi 3 and two usb cameras which i would like to use to begin with OpenCV. For start, would like to have them merged and full screened on Raspberry Pi which is connected to monitor.

I understand there is so much surveillance software but i want to keep it live view, no recording, and to have it start as fast as possible when i click icon on raspberry,

I hope RPi 3 is strong enough, if not maybe go Intel NUC route. I'm hoping for 5-10fps at 720p resolution, hope it is doable on RPi. Maybe get RPi4? :)

Thanks!