The camera is useable for both photo taking and video recording. You can switch between front and rear camera, the flash can be turned on and off, pinch to zoom in. While recording a video, the flash can be used as a flashlight. It allows you to limit the photo and video resolution.
If you want to launch this app at pressing the hardware camera button, you might have to disable the built in Camera app in Settings -> Apps -> Camera -> Disable.
Contains no ads or unnecessary permissions. It is fully opensource, provides a Dark theme too.
This app is just one piece of a bigger series of apps. You can find the rest of them at http://www.simplemobiletools.com