Interactive videos keep the viewer engaged, help highlight critical points and can assess the viewer’s knowledge. The annotation and spotlight options within YouTube can be used to link a series of videos you have created.
[youtube]http://www.youtube.com/watch?v=C5zzVemi3m4[/youtube]
Read more about YouTube annotations: https://support.google.com/youtube/answer/92710?topic=14354&hl=en
There are also services designed to create video-based quizzes.
Blubbr is a free service structured to allow the viewer to watch a short clip followed by a multiple-choice quiz about the clip. Immediate feedback is offered after each quiz.
Try a short quiz in Blubbr: https://www.blubbr.tv/game/index.php?game_id=28568&org=0#.UuAlZpH0CiA