The videos linked here are in addition to ones used in the structured discussion of orienteering skills in Better Orienteering. All the instructional videos used in Better Orienteering are listed under the Useful Websites on Orienteering and Other Resources section.
There are many great orienteering videos that give a sense of what orienteering is all about and showcase orienteering around the world. Some show the map and head cam footage, which can be a good way to see what orienteering looks like at a high level. Other videos promote particular major events such as the O-Ringen in Sweden, and the Jukola relays in Finland, the two largest events each year. The compilation of links below gives an overview across orienteering. (Thanks to Tony Callow, Wrekin Orienteers for many suggestions from hours and hours of armchair orienteering!)
Great overview videos
Orienteering around the world