To also add to the above, so many candidates struggle with video interviews because of a lack of practice. Just like anything, if you've never practiced it before, you'll likely struggle with timing, feel nervous and lack composure.
If you want to get 'good' at video interviews - or at least find them easier - try to simulate a video interview session as best as possible (even if it's just recording yourself with a limited time to answer unexpected questions). While you can't know what questions will come up, if you do this enough times, you should hopefully be able to stay composed and confident when answering difficult questions.
