i am building an app using expo where i want the user to be able to create videos by recording the audio and video separately after which the app automatically overlays the audio over the video that results in a video with a voiceover. i dont want the audio and video to be uploaded to my app through builtin recording app and camera, i want have the app itself to be able to record both audio and video which can be done using android media modules i think. i want this as one of the features of my app, its not the entirety of the app itself.

i am somewhat of a beginner and i have no clue how i can do this and google and youtube searches turned up nothing. i would appreciate some help.