This is a paid asset, but now you can download Portals package 2 Free.
Detail this asset from Unity Store: Original Link
Portals package 2 v1.0
“If possible, please buy the package to support the developer”
This package includes 8 portal effects.
Supported all platforms (PC/Consoles/Mobiles/VR/…).
– HDRP/LWRP SUPPORTED!
– Works out of box (just drag and drop)
– Demo scene includes
– HDR Bloom particles/effects
– Works with 2D and 3D
If you have questions or suggestions, send them to my email