For an experienced developer that has experience with developing camera related apps this should be an easy task.
There are two parts for this app.
Functionality needed for part 1:
Log the activation trigger of the stock camera app (which app startet the camera) and the currently set image destination.
For example :
If a user activated the stock camera app from Telegram, our log should contain :
Trigger app: telegram
Destination : /storage/emulated/0/Pictures/Telegram
(in case that is the actual image destination)
Functionality needed for part 2:
When the user tapps the app's icon, it should launch the stock camera app.
There should be a floating button on the camera ui that reads: "set destination".
When the user tapps the button a pop-up should appear where the current image destination is already visible in a text control.
There are 3 buttons on the pop-up :
If the user selects "browse" a folder selection dialog is opened that the user can navigate and select a folder.
When the user selects "ok" the dialog closes and tje selected path shows in the destionation dialog.
Pressing "ok" on the destination dialog sets the image destination for tje camera to tje selected path.
In your message include "hula hoop" so I known you read this.
Pressing "cancel" on any of the dialogs closes the dialog with no action.
Feel free to submit questions for clarification.
I have many more such projects that can follow if I am happy with the results.