Recording live video interviews on location can be difficult. The key to success is to make the process as simple as possible, so you continue to record and release interviews.
As there may be many variables during a shoot on location, you need to be able to keep track of multiple things during the interview. The most important things to focus on are:
Is each microphone coming through clearly?
Are there any sounds that would make it hard to hear the interview (e.g. passing trucks, air conditioning on, machinery)?
If any of these are not right, you will probably need to record again!
The interviewer should hold the camera and interview the subject at the same time
Keep a tight frame - don’t have lots of empty space around the subject
Don't zoom erratically – Ease in and ease out of zooms
If someone starts speaking off camera, move to them slowly and smoothly without rushing (it is OK for them to talk off camera for a short time)
To record both voices use a single shotgun microphone for both interviewer and subject