How would you make a preview of a portal entrance

Sorry for the Confusing title, What I want to do is make a portal type thing where you can see where you can go but its not actually a psychically going there but teleporting.

this is what I mean, that clip is from Parkour Tower.

I dont need any full written out script I just need a general idea of how to do this≥

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viewport frames would probably work

Yeah just add a Viewportframe on a SurfaceGui in the Portal and just put whatever parts u want the player to see in it, then set the ViewportFrames Camera CFrame to the Players Camera CFrame in a loop.