How to ask the camera to zoom out in a runner game with 2 players ? (when a player leave the screen)

I'm doing a 2D runner with two players, I would like the camera to automatically zoom out when one of the players leaves the screen, and to automatically zoom when both players are visible on the screen. As in Broforce for example.

To summarize I would like all players to be always visible on the screen.

How can I do this ? I can't find a tutorial on youtube..

Thanks a lot !

howtoconstructdemos.com/auto-zoom-and-scroll-the-screen-to-fit-multiple-characters

thank you, I had already seen it, it just shows the result by explaining vaguely, we do not see the process

because there is written for example "local number padding = 10" in his code, but if you do not know how to write that, it can be hard to guess,

but i didn't see that we could download the project, it's awesome i will be able to get out of this,

thanks