Give advice on what company to apply for the development of video chat. We need a video chat for communicating with clients, as well as for communicating with other employees. We have a large staff, about 2000 employees.

You can also use ready-made video chats and messengers to communicate. It's a lot easier, but not all applications are perfect.

You are right you can use and ready-made applications, but they do not take into account the specifics of our company, as well as we need additional features that are not in common programs for video chat.

If you want limited features, then you definitely need to develop an app. Since zoom-type applications are not designed for fine-tuning. Your best bet then is to contact this company for video chat development https://owlab.group/our-blog/post/how-to-create-a-video-chat-app-features-techstack-and-development-cost . This team of developers is very experienced and they have developed similar projects many times before.