Imgur's .gifv isn't supported when used in a  markup . I know it's not exactly an image, but then neither is an animated GIF.
daenney
All 3 comments
Hi @daenney, thanks for the request. We don't currently support video embeds in markdown, and we're not currently adding any more extensions to our Markdown support. Someday we may adopt CommonMark, so you might be interested in this conversation
Either way, there's not a change we could make to this project to implement support for it, so I'm going to close this issue. Thanks again for the request.
bkeepers
on 4 Mar 2015
If anyone's interested - wrote this to use with my team, but recognize that it might be helpful to others as well https://github.com/rikonor/github-gifv-support
rikonor
on 22 Sep 2016
I wrote and maintain an extension that renders .gifv from several sources (imgur, gfycat, instagram) in GitHub issues. It will also work with comment previews and XHR-rendered comments because it uses MutationObservers to scan for dom changes and process new gifs.
qrohlf
on 25 May 2018
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Most helpful comment
I wrote and maintain an extension that renders .gifv from several sources (imgur, gfycat, instagram) in GitHub issues. It will also work with comment previews and XHR-rendered comments because it uses MutationObservers to scan for dom changes and process new gifs.
https://github.com/qrohlf/GifHub