How I can proxify jitsi from one domain to other?

Hi Jitsi.

I have installed jitsi-meet instance on DOMAIN1. It works fine.
Can I setup nginx on DOMAIN2 for proxify all jitsi-requests to DOMAIN1?

I don’t want to install another one instance on DOMAIN2.

Looks like you only want to use different domain for the presentation. If that is the case, take a look at the IFrame API.