You can learn some aspects of the current SEO methods and best practices on YouTube but since many of the videos there are years old, lots of the information is outdated and not accurate and good. The trick is going to be to find what is still relevant and won't actually hurt your site.
Lots of the old methods can be actually harmful to the rankings of your site.
You would have to find videos from trusted sources and watch those. It would also be best to check the information that you find on YouTube against trusted websites and blogs that are known authorities on SEO.
So yeah it's possible, in part, you just have to be able to weed out the good information from the bad or outdated information.
Good Luck.
