I'm late to the party but you could still give it a shot with frigate. I have kinda new hardware intel n100 (no coral) but as far as threads and speed, your old i7 is better according to specs sheets so I'm guessing it will work well enough for a few cameras without coral.
One of the reason for me to upgrade was power draw, specs like yours will consume a lot of energy, has a tdp of 95W while n100 is 6W.
Also transmission which is also open source