by Justin Hunt.
Sadly it is not a bug. That is just the way it is. Comments can only be text comments.
You could enable the Feedback Files, and then upload your video into there. But it wouldn't play inline.
You could also use PoodLL feedback to record a video using your webcam as feedback.
It would be nice to have a YouTube Feedback I suppose to keep it all in the same family. If enough people are interested, it might be worth making.