Here is a guide that contains more details on how to go about it:
- Unlock the phone. The guide isn’t applicable if the camera app is launched from the lock screen so it is important to unlock the screen.
- After the Camera app is launched, tinker the Settings. It is also recommended that you turn off the flash. Turn on the mute mode to disable any shutter sound, and in the end, decide on whether you want to make a video or shoot a picture.
- After deciding, tap the Home button twice, bring up the multitasking mode, and press the Volume+ button to start the recording or shooting. You can do this while scrolling in a normal way through the list of apps, making it look casual.