If you have a legally purchased DVD (your personal property or checked out from the Library), playing the DVD on your computer and sharing your screen via Zoom falls within copyright Fair Use under the following conditions:
Technical advice for sharing your screen in Zoom to show a DVD or video (YouTube, etc.):
4. Use only the portion necessary to support your pedagogy (don't show the whole thing unless you must).
5. Instructor commentary and lecture during the course of the video greatly increases the fair use defense of this activity.