Best way to stream raspberry pi camera video to a backend, and then to the frontend using AWS IVS?

Hi!

I have a raspberry pi camera attached to my raspberry, I already built a small demo in which the camera sends the video to AWS IVS and I can retrieve it from my java app and then redirect it to my frontend in real time using pusher.
But I saw that AWS IVS is expensive if I want to have a live feed going on too much time. Also I saw that I should have one channel per camera.
There is a way of doing this in a better way? Or via https or webshockets using another technology or something? I will have more than one camera attached to more than one device, the idea is for the user to see each camera feed individually and privately.

Thanks!