I just contacted the support of one of our service provider for virtual tours. I told them that the iframe will open the website (in target self) instead of playing the tour, and that our clients will most likely not come back to our site, when they don't see a "go back" or something. Best would be, if the iframe plays instead of opening a new tab.

Supports answer: "I sent you a video, there you can see how to get back to your website"

*sends a video of themself opening his browsing history and clicking our site*

A dream of every UX developer.