As a precautionary measure, we going to say no to this. The reason is, if a speaker is unhappy with a video we did, we have control to remove it and don't have to worry about getting in touch with other channels to remove it.
However, you add the video to a playlist on your channel. This avoids you have to download the video and re-upload it.
Read this for more information:
Quick steps, simply go to our video in YouTube and click this SAVE button and it will allow you to create a playlist on the fly or add to existing playlist of yours.