Yes, the footage watermark can be turned off like so:
1. Turn on the camera.
2. Stop it recording (press the red square in the bottom left of the screen).
3. Go into Settings (the cog in the top left of the screen).
4. Go into Setup.
5. Scroll across to System Info.
6. Click on System Info.
7. Press and hold on the right hand side of the screen.
8. A pop up will appear stating ‘Turn Off the NEXTBASE Stamp?’.
9. Select 'OK'.