Hi Mehmet,Take look at this post : https://www.contus.com/blog/best-video-calling-apis/ This post will explain how to create video conferencing app and highlights of features with technology. 

Hope let you try and build clear Hq video conferencing app. 

There are a lot of good resources out there. 

1. https://hackernoon.com/video-conferencing-technology-the-hows-and-whys-hw5d3xdw
2. https://tweakyourbiz.com/technology/mobile-technology/chat-api-providers

From the first link: "How to Integrate Video Conferencing Technology to Your Existing App"

From the Second Link:”List of Top Chat API Providers for your reference.

Yes it possible .In choosing the right conferencing solution, businesses must consider the purpose, security standard, scalability of the conferencing solution that enhances the business growth and productivity of the businesses. i hope you this article will help you all your questions https://www.codementor.io/@richardjohn/video-conferencing-build-vs-buy-which-is-best-for-your-company-15r4u0cqqt

Whenever you are looking the best video call app, here you can use the best video calling SDK app to use for long purpose. It makes everything cool to consider right solution to build video calling. https://www.trustfirms.com/live-video-calling-apis-sdks-for-web-mobile-apps