Find a friend who has Powerpoint. Make your presentation in Openoffice, leave a blank slide for the music video. Save your presentation as type .ppt (Save As, file type MS Office 97/XP/2000, Automatic file name box to be checked). Take your presentation and video to friend's computer and there insert the music video; now save the presentation. Use that copy for class. Best to check it on another computer well before class to be sure it works.
Apache OpenOffice 4.1.1 on Xubuntu 14.10 and Win2K/XP