How to change author in learning journey or video?

Is it possible to change the author of a learning journey, if e.g. the current author leaves the company or is on long term leave?

What happens to Learning Journeys and videos created by a learner, if the learner leaves the company or is on long-term leave and thereby becomes an inactive user? Will the LJ/Video also become inactive, be deleted or will it still be available.

If the LJ/Video is still available, will an admin be able to change the author to another user?