If you’ve decided to add a video calling feature to your app, the easiest way to do it is by integrating a video call API. Here are some of the popular APIs that are feature-rich, secure and easy to use.

MirrorFly: MirrorFly is a leading in-app communication provider that offers 1000+ customizable video, voice and chat features. It simplifies the way you build video calling apps for your business with the freedom of accessing the full source code. Above all, you can host your app on your own servers or MirrorFly’s cloud servers.
https://www.apphitect.ae/blog/best-video-sdks/