Slide your finger left on the display to open the main menu.
Tap Lumia Camera.

Tap the video recorder icon.

The following steps describe how you:
Zoom in or out
Turn video light on or off
Select resolution
Record a video clip

Drag two fingers together or apart to zoom in or out.

Tap the video light icon to turn video light on or off.

Tap the settings icon.

Slide your finger left on the display to select video.

Tap the field below "Resolution".

Tap the required setting.

Tap the return icon.

Tap the video recorder icon to start the video recorder.

Tap the stop icon to stop the video recorder.
The video clip is automatically saved.

Tap the home icon to return to the home screen.