You may have a video start at a specific time by adding &start='seconds' to the end of the link, where seconds is the number of seconds into the video you'd like the video to start. For instance, https://howtovideos.hosted.panopto.com/Panopto/Pages/Viewer.aspx?id=816a7666-1ae3-49b0-957c-6455edee8554&start=30 would start the video at the 30 second mark.