YouTube has been integrated with Google Lens: you can search for videos by pointing the camera at an object

The update is rolling out in stages and gradually

Google has updated the YouTube app for Android, adding integration with the Google Lens service. This allows you to search YouTube videos using the image from your smartphone camera. 

If you have the latest version of YouTube installed, you can find the Google Lens icon on the search page next to the microphone icon at the top of the screen. Clicking on it will open the Google Lens interface.

For example, if you point your smartphone camera at the keyboard, the service will provide the ability to search for the query «keyboard» in the YouTube app. There is also a Google search option.