Most android audio recording apps automatically recognize audio input when external microphone jack that is plugged in is TRRS compatible (usually one of 2 standards: CTIA and OMTP) .
Search as i may, i have not come across a camera app which records video with the external microphone. Therefore, as a last resource, I am considering eventually developing one.
Before i embark on a project which just might be a reinvention of the proverbial wheel or worse, a lead balloon:
Is there any impediment for such an app to work?
Corollary: Is there any camera app which recognizes external mic's (automatically or via setup)?
This app does what you want.
Cinema FV-5: professional videography application for Android