Goals? Functions?
The toolbox 'Focus Craftership: filming living heritage' uses the term 'function' to address the actual goal a filming project has. For example, you might film know-how and skills of a heritage practice as tutorials to ensure transfer, or you might film a recruiting trailer to promote it.
The different functions require different filming methods as they have different goals. It is therefore necessary to first establish what the end goal of the video is before you start filming.