Notificiations "openvideo-streaming.github.io"

Hello, I'm getting constat notifications about 

"Threat neutralized
We have safely disconnected your connection to the site openvideo-streaming.github.io, because it was infected with URL:Scam" 

I've never opened this site and I'm getting those notifications whenever I'm trying to watch videos even on youtube - Is it something dangerous? What should I do with it?

Hello Jakub,
You've reached the AVG community support forum.
We regret the inconvenience this has caused you. We'll certainly look into this and answer your queries. Before we proceed, would you be so kind as to share us a few screenshots of the threat pop-ups you're referring to?
Note: Kindly click on "See Details" on the threat pop-up and then share us the screenshot. Refer to the below article for detailed instructions to capture a screenshot:
https://support.avg.com/SupportArticleView?urlname=AVG-Create-screenshot . Does the threat pop-up appear when you're trying to access a particular website using a certain browser or irrespective of them?

Awaiting your response.

Hello Jakub,
You've reached the AVG community support forum.
We regret the inconvenience this has caused you. We'll certainly look into this and answer your queries. Before we proceed, would you be so kind as to share us a few screenshots of the threat pop-ups you're referring to?
Note: Kindly click on "See Details" on the threat pop-up and then share us the screenshot. Refer to the below article for detailed instructions to capture a screenshot:
https://support.avg.com/SupportArticleView?urlname=AVG-Create-screenshot . Does the threat pop-up appear when you're trying to access a particular website using a certain browser or irrespective of them?

Awaiting your response.