Would that be possible without stuttering (ideally not below 30 FPS) (power supply via good power bank) + the camera + possibly a microphone
Operating system: Raspbian (not bad if it has to be another operating system)
1GB RAM, 1.4GHz 4 core CPU
If you already have everything there: try makes smart. If you want to get a Pi first: the 4er with 4GB RAM. Although I do not know the hardware requirements for streaming, I lean out of the window and say: It will be very cozy with a Pi. A short research showed the following recommendation:
i5 from fourth generation or AMD equivalent
8 GB RAM
Okay, first of all thank you very much, but I think a stream with low quality will endure