If they are climbing a mountain or a ladder, then yes.If you can't expand outside some set of uncodified 'rules' then perhaps it's you who isn't thinking...
Human bodies are vertically-orientated. If you're making a video of a person doing something individually then portrait orientation makes sense.
If they are walking horizontally, no.
If they are just staying/sitting and talking alone, then no video is needed. A text transcript would be better.