I am going to start this with a preface that I have no personal experience, I'm just relaying things I've seen in the Community or encountered in other areas.
This was a couple of years ago, but it may still be valid. I don't have students submit any videos to confirm this. This is also from the teacher side: Is it possible to download a media submission? If that doesn't work for the student, you may be able to download it for him and then get it to him.
Canvas makes student submitted work available to them and they can go to Account > Files and find them. I think videos are a different matter because of the size, but it may depend on how they were uploaded. You might have the student check there just in case. I say this because some of our teachers have students upload media submissions and there was an issue with their quota going over -- even though it was part of a submission, it still got uploaded to the files section for the user.
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