There are 2 types of video interviewing:
Pre-Recorded Interviewing & Live Interviewing.
The difference is SIMPLE.
Pre-Recorded

With pre-recorded, applicants complete the interview by responding to pre-set questions and the system records their answers, meaning there’s no recruiter attending the interview.
“Like Netflix for Interviewing”
Live

When using live, applicants are talking to a recruiter face-to-face in an online interview.
“Like Skype but built for recruiting”