Description:-

In the declarative Camera example, when using the "Video mode" and clicking the "View" button, the screen turns black, rendering the video preview unavailable. This issue is specific to the "Video mode," as the "Camera mode" successfully hides the "View" button until a picture is captured.

Steps to Reproduce:

1. Build and Run QML Camera Example on Android.
2. click on "Switch to Video" mode.
3. click "View" button (without recording any video).

Expected Results: "View" button should be hidden unless there's video content to show.

Actual Results: Clicking the "View" button in "Video mode" results in a black screen. 

Note:- This behavior does not occur in "Camera mode" as the "View" button is hidden until a picture is captured.