Printoid is the only app to brings you the support of not only one but two video streamings!
This feature is only available in Printoid PRO and PREMIUM.
If you have installed the OctoPi image on your Raspberry Pi, then you have to follow this tutorial:
Support 2 cameras (OctoPi)
RASPBIAN + OCTOPRINT USERS
If you have installed Raspbian on your Raspberry Pi, and OctoPrint on it, then you have to follow this tutorial: