 This quick tip came to me when I had stopped during a bike ride to take a photo with my phone. I opened up the camera app and somehow, instead of clicking on the shutter button, I slid my finger from the shutter button to the right towards where the front rear camera button is on my iPhone. The app immediately started a video recording. If you release your finger from the rear front camera or from the right there, it will continue to record until you click the shutter button again to stop it. Alternately, if you still have your finger on that rear front camera button, you can slide it back or you can just grab it and slide it back. He says, I like this much better as it is a one step process to record a video rather than having to select video and then press the shutter button. That's how you lock a video. The way that you record a quick video is just hold down on the camera shutter button while you are recording.