Video to resume after course has been exited?

In a course, containing long videos (30 min +), learners jump in and out of the course.

I want the video to resume where the learner left off, rather than have to start the video from start. Slide properties are set to "Resume saved state". Layers, where the videos are, are also set to "Resume saved state". However, when learners leave the course and re-enter the videos don't resume. Is this expected behavior?

Now, here's the tricky part. The videos are mandatory. Hence, learners are not allowed forward seeking before the whole video has been viewed once. So I cannot "Show video controls" below video and let them skip to the place they were... 

Has anyone encountered anything like that? Any good suggestions, please?

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