https://www.cnet.com/news/the-vivo-nex-has-a-pop-up-selfie-cam-heres-how-it-works/

If you love gadgets, here's a sight to behold: The inner workings of the Vivo Nex phone. It's got a motorized pop-up selfie cam that helps maximize your screen real estate -- since the camera doesn't have to live on the front of the phone. No notch!  

We just unboxed this phone, but MyFixGuide has actually already torn it apart, revealing for the first time how that mechanism actually works.