It’s quite easy. Just go to youtube.com/analytics and you’ll find a fully equipped analytics panel (you must have a YouTube channel first).
Results of activity on YouTube
You can check not only how many views your videos have, but where viewers stopped watching them, how long they watched, and viewer demographics. You’ll also find sources of traffic and what device your videos were being watched. All of this in one handy dashboard.
But that’s not all, mind you. YouTube analytics panel lets you also check engagement indicators like shares, change of subscriber’s number, how many of your videos were added to other users’ playlists. If you added annotations to videos, you’ll see there how many people clicked them.
If you want more, you can use a social media analytics tool like Sotrender. A tool like this will give you more data and more indicators of your performance, making it easier to improve.