I have macbook air, it has a camera I have never used but now I need to. How I can use it, play the recording and delete it and stop the camera? I need to take a video from a thing on the table.

The camera is accessed via various applications. The simplest way to record a video is via QuickTime Player -- just go to File > New Movie Recording and select the built-in camera [see screenshot below]; then just point & shoot. This Apple support page provides links to other application-specific instructions for using the camera -- just select your version of macOS up top.. https://support.apple.com/en-in/guide/mac-help/mchlp2980/10.15/mac/10.15

Thanks for the information! How I can get that Quick time player on the top aside apple as you have on the screenshot? I have there Finder. I know how to get ( open ) Finder there, it's on the bottom. But where is the Quick time player? What it means quick? I need to record the thing hours. If I record with that camera, does the recording takes a memory and saves to the harddisc? How much memory an hour by camera will be used? Video included. https://youtu.be/Y4Bk8LIEv_I

QuickTime Player comes with every Mac. Just open it up from the Dock and you'll see its menu up top. Here's Apple's manual for it: https://support.apple.com/guide/quicktime-player/welcome/mac And here's the section on recording a movie [with the camera]: https://support.apple.com/guide/quicktime-player/record-a-movie-qtp356b55534/mac Yes the movie will be recorded to your disk [just like audio] only the file will be much larger, depending on resolution -- High Quality [1280x720] or Maximum Quality [around 7x-8x bigger]. Do a short test recording and then extrapolate from that to determine exactly how large any recorded movie files will be -- then make sure you have enough free space on whatever hard disk you Save the recording to.

At the beginning I got my mac I deleted many icons from dock, so I don't have the Quick there anymore. Can I find it from the launchbag?

Open your Hard Disk in a Finder window and go to the [root-level] Applications folder -- you'll find QuickTime Player there. You can open it directly from there or drag it to the Dock for easy access in the future.

OK, I try tomorrow. I have used spotlight for searh, but I don't remember how I did it. The spotlight has also anything about mac.. ?

A Spotlight search for "QuickTime Player" should also take you straight to it.