We're sorry to hear about the videos not getting imported into Lightroom, could you please let us know what exact version of Lightroom you're working on and which operating system are you using?
Also, where are you importing the video from a network or an external drive? Could you try copying a video to the desktop and then try importing it into Lightroom and let us know if it helps?
You may also try unplugging any external devices and then try importing the videos and see how it goes.
Are there both still images and videos on the card and or in the folder you are trying to import from? If they are Move/Copy the videos to a separate folder and do an import of them by themselves.
Thanks for replying. I was trying to import from the desktop. I ejected my other drives and restarted and it works now.
For the record I'm on:
Lightroom Classic CC 2018 (whatever the latest version is)
MacOS High Sierra