You can generate embed scripts from YouTube and use that html script in the article.
A YouTube video can be embedded into an article if it is really required and relevant to the article topic. You simply need to copy paste the tag which YouTube provides below a video. You have to:
1. Click on 'Share'.
2. Then click on 'Embed'. You will see in the white box the tags starting with 'iframe'. Copy-paste that string of letters in the exact point of your article where you want to place it.