App-supplied callback that is passed a list of available cameras and returns one of them.
The callback must return one of the objects in the list argument. In all other cases, the callback's result will
be ignored and the default camera selection logic will apply.
App-supplied callback that is passed a list of available cameras and returns one of them.
The callback must return one of the objects in the list argument. In all other cases, the callback's result will be ignored and the default camera selection logic will apply.