From the rule 6.4.2 Video/Audio from unsupported players:
If it is not possible to represent the widget as an iFrame, but it is possible to get a direct link to the video/audio, use this link to generate a <video> or <audio> with the correct src attribute. Otherwise, mark the object with the @unsupported function.
@unsupported function has low priority. You can get gfycat video src and make your own iframe.
You've omitted the first part of this paragraph. It says that you should leave an iframe as it is if one is available.
Declined by admin
Type of issue
IV not generated for target page
Reported
Feb 9, 2019
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If it is not possible to represent the widget as an iFrame, but it is possible to get a direct link to the video/audio, use this link to generate a <video> or <audio> with the correct src attribute.
Otherwise, mark the object with the @unsupported function.
@unsupported function has low priority. You can get gfycat video src and make your own iframe.