This may be of interest to you if you are at a school and planning to do some video interviews.
I've been preparing a short workshop to help some 6th formers get ready to conduct video interviews about the 1980s anti apartheid movement in Leeds. Interviewing on video can potentially fail for all sorts of reasons – poor questioning, unfamiliarity with the equipment, unclear sound, etc, etc.
Like all good workshops the participants are not told what to do but discover the best practice for themselves. For the workshop I'm only preparing a list of questions to prompt discussion.