Can you import the same videos into the iOS Photos app? If iOS itself supports your type of video, then Lightroom should be able to see it and import it. This may be a limitation of the device/OS.
If you have access to a Mac or Windows PC, sign into your same account at https://lightroom.adobe.com/, and drag and drop the videos into your library or specific album. The Lightroom web app is generally able to import more kinds of file types.
Welcome to the Lightroom community. I'd love to help you figure this out. I'll need more information on this.
What format are the videos saved/shot in? Can you copy the videos manually to the iPad storage & import them to Lightroom?
Please share some sample videos with us. If you're using HEVC video format, it will not work as HEVC from non-ios devices is not fully supported with Lightroom. Try importing an MP4 video from the GoPro & let me know how it goes.