MoCa

Records video in background when motion is detected or at user request.

The best motion camera recorder.

It allows to record video immediately or when a movement is detected.

The recording is made using the main or secondary camera, and it's performed in background.

It allows recording even if screen is off.

It uses autofocus to avoid blurred videos.

Easy recording/detection start and stop from an app Widget.

It automatically stops recording when battery level is low or when there's no enough space in the output destination.

Only in paid option:

1. Use the highest quality for the recording.

2. Define a start delay for the detection/recording.

3. Change the recording duration; by default 1 min.

4. Mute the camera sound

5. Change the output directory for the recordings.

6. Define the video extension.

7. MASK the application texts and icons.

In free version...

You can enable the paid version options for one recording, just by watching an ad video.

https://forum.xda-developers.com/android/apps-games/app-moca-motion-detection-recording-t3735857