YouTube embedding in video portfolio shows plain, unparsed shortcode

Hello,
I’m using video portfolio format.
“Paste your Video Embed Code” – in this section I’m putting this exact code:
<iframe width="560" height="315" src="https://www.youtube.com/embed/1V7ReGImc8c" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
In the post it’s being shown as:

[youtube https://www.youtube.com/watch?v=1V7ReGImc8c&w=560&h=315]

Clearly (maybe) there’s some plugin I’m missing but I couldn’t find it in support documentatiopn, this is why I’m writing here.

Here is the post:

http://dronburgas.com/portfolio_item/%d0%bf%d0%b0%d1%81%d0%b0%d1%80%d0%b5%d0%bb%d0%ba%d0%b8%d1%82%d0%b5-%d0%bd%d0%b0%d0%b4-%d0%ba%d1%80%d1%8a%d0%b3%d0%be%d0%b2%d0%b8%d1%82%d0%b5-%d0%ba%d1%80%d1%8a%d1%81%d1%82%d0%be%d0%b2%d0%b8%d1%89/

Please help.
Greetings