A free app for Android, by Picsanto Team.

BLACK CAM is the best choice for you if you want to make a video recording without any background noise and even without displaying the screen on your device. You can make long recordings without any limitations, even without a video camera.

There are several advantages to using BLACK CAM, the most important of which is that you don’t need to display the screen on your device- saving more battery consumption than other camera apps.  Another advantage is that you can use the built-in microphone to record your voice. You can also make video recordings in any place, even in a loud place.