The video shows USB Camera Pro PIP (Picture In Picture) support and about camera permission while running on Android 9.0 and above.
Now you can also use PIP feature on Android 6.x and 7.x devices which requires ‘Display over other apps’ permission as you can see from the video.
And beginning of Android 9.0 it also requires camera permission to use external USB camera as you can also see from the video.
You can also see USB Camera app supports UVC device with H.264 format input.😁
You can try USB Camera app from Google Play :
You may also interest the Pro version :