I have found the way to just using your iwatch to record videos publicly, or secretly record videos. Here is a How to Step by Step Guide
In order to have iwatch left on recording mode to continue recording daily instead of Photo shoots on Camera mode you must first do this.
1. Start recording video with your iPhone,
2. Open up the video still being recorded on your iPhone on Your Apple iWatch
3. then Stop the recording on your IWatch.
4. Close up the Camera app windows on your cell phone.
5. Finally you can now Start opening, and Closing the Camera App on your iWatch to just record videos at anytime on the iWatch.
6. Whenever you just want to take Photos again, Open Camera app on iWatch, and just switch video mode to Photo mode using your iPhone.
7. When you want to leave Camera mode on Video recording again, switch on iPhone to video recording, Close up the Camera app on your Windows screen, and you can Open it again ready to Secretly record on your iWatch