Hello and welcome to Apple Support Communities, Carla1961.
If I understand your post correctly, you are trying to import a video from a DVD to your Mac. I'd like to help.
Try the steps here:
You can import photos or video files from a storage device (such as a hard disk), a CD or DVD (if you have an optical drive), or a flash drive.
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Connect the device to your Mac.
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Do one of the following:
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Drag files or folders from the Finder to the Photos window.
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Drag files or folders from the Finder to the Photos icon in the Dock.
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In Photos, choose File > Import. Select the photos or videos you want and click Review for Import. If you selected multiple photos or videos, select the ones you want to import and click Import [number] Selected or Import All New Photos.
Important: Don’t eject a disc or drive while the photos are being imported.
Imported photos appear in the Imports and Photos albums in the sidebar.
Tip: If you use iCloud, you can copy photo files to iCloud Drive from any Mac, iOS device, or Windows PC you’ve set up to use iCloud Drive, and then import the photo files to your Mac from iCloud Drive. See Store documents with iCloud Drive.
See the full article here:
Import photos from storage devices and DVDs using Photos on Mac
Let us know if that resolves this issue for you.
Thanks for using the Apple Support Communities. Take care.