Android phones normally have a recording function, but if it happens to malfunction, you can always download and install the background video recorder app from Google Play Store.

The background video recorder app has a lot of convenient features, including quick recording for quick filming. What makes this even better is it records with or without a preview and when you are on a call with someone. You can even turn off the screen of your phone and still keep recording.

This app can be protected by lock if you set up a password, so you can protect your privacy.