Скачать или смотреть How to use android phone as webcam for pc via usb

You can download droidcam through playstore.
Link for PC client of droidcam "https://www.dev47apps.com".

Steps:-
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1.Download an app called ‘DroidCam’ from the Google Play Store. Also, download the web client of DroidCam.

2. Droidcam can access your smartphone’s camera in three ways - via USB, Wi-Fi and Wi-Fi server.

Set up via USB
There are chances that your Wi-Fi is not fast enough to transmit data over the internet. In that case, you can access your smartphone’s camera as a webcam via USB.

First download all USB drivers for your device on your laptop

The USB connection will take place via ADB so you need to enable ‘USB Debugging’ on your smartphone. For that, go to Settings - Developer Options - Enable USB Debugging.

Check if your device is connected via ADB by running the command ‘adb devices’ in Command Prompt.

Once done, go to the DroidCam web client again, navigate to the USB tab and hit Start.

To enable Developer Options on your Android device, go to Settings - About Phone - Tap Build Number a bunch of times.

Once you are done setting up, you will need to manually change the webcam source on the client you wish to do video call on. Skype and Google Hangouts have a simple option in settings to fiddle with both video and audio source.