360 webcam processing

Hello everyone!

I've got new 360 camera (Insta360 Air) and I wanna translate video-thread from webcam to Unity.
I used flipped sphere and class WebCamTexture and it works but look at this:

I need to remove this distortions. I've checked out an image of my webcam and I've seen this:

So, is there a way to make my webcam view like this?
Thanks in advance.

Edit: Okay, um... Shortly: how to make stereoscopic texture to monoscopic texture? Got it?

 

I found him: https://community.theta360.guide/t/simplest-webcam-test-in-unity/516, but I can't realize how he has done this.