Compliance Caseworker virtual pre-recorded interview?

Hi all, I'm currently applying for a position as an HMRC compliance caseworker. The next step is a pre-recorded interview. I've never done one of these before and it seems very strange to be interviewed in this way as in an interview you can normally pick up cues from the people interviewing you. This of course will not be possible with a pre-recorded interview, so I'm getting very nervous. Has anyone been through this process who can give me a few tips (Not answers) just to help calm my nerves?