Pinch to Zoom on Any Video
Another recent feature you should totally know about is the ability to zoom in and out on your favorite YouTube videos.
You can use this to zoom in on a class you’re watching or to find the hidden details movies hide in their trailers.
Whatever the reason is, you can zoom in by pinching the YouTube video with two fingers. At the top of the video, YouTube will let you know how much you’ve zoomed in. You can then zoom out until YouTube tells you you went back to the original size to keep watching normally.