Summary
It is possible to embed YouTube videos in GitHub pages by creating a folder called `_includes` and adding an HTML file with the relevant code.
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This HTML and CSS code can then be used to embed the video in the markdown file.
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Alternatively, the video can be uploaded to a video hosting service like YouTube and the link can be added to the description.
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Summary
GitHub Pages is a great way to host some of your content online. All you need to do is to write some markdown files and tell GitHub to create it as a page.
The problem is that you can’t just add some HTML into your markdown to – for example – embed a YouTube video.
Quick tip: embedding YouTube Videos in GitHub pages
christianheilmann.com
Summary
It's not really possible to properly embed a video in a Github comment, pull request or issue like it's possible for images for instance. So if you want to put a video in a Github pull request (I do that quite often), you have to upload it to a video hosting service like Youtube and then you can put the link in the description.
Embed a Youtube video in Github markdown - damien.pobel.fr
pobel.fr