It is possible ,but you have to follow the just 5 simple steps .
1. Open Youtube (Easy enough , great you did it let's see next).
2. Search and play your video. (Isn't it easy).
3.Now critical but simplest copy the link showing in address bar of browser shown below in figure.
4. Now open a new tab in browser and delete https://www. and write ss followed by your
youtube link,like i did in below figure.
5. A new website will appear and you have to click on Download and that's it. (finish omg so simple).