How to Record Video Using the Volume Key in Android 4.4.2 Kitkat

Samsung Galaxy S5: By default, the Volume key in the stock Camera app is set as the zoom key that can be used to adjust the zoom level. But, if needed you can assign this key to other functions, one of which is as the video-recorder key. Set the Volume key as the video-recorder key will let you start and end recording videos simply by pressing the Volume Up key or the Volume Down key.
How to set the Volume key as the video-recorder key in the stock Camera app?
You can do so by using the following steps:

1. Open the stock Camera app.


2. Tap to open up the detailed settings menu.


3. Scroll the settings menu to the very bottom.


4. Tap Volume key and then select Record video.


5. The Volume key has been set as the video-recorder key.

How to use the Volume key to record a video?
When you have set the Volume key as the video-recorder key, now you can use this key to start and end recording a video. See the following steps as the example:

1. Open the stock Camera app.


2. Aim the camera to the object.


3. To start recording video, press the Volume Up key or the Volume Down key.


4. Since there's no key that can be used to pause or resume the recording. If you want to do so, you can use the on-screen icon by tapping  to pause the recording and tapping  to resume the recording.


5. To end recording video, press the Volume Up key or the Volume Down key.