Using a Campark ACT74 action cam as a webcam in macOS 10.12
According to the User Manual available here this actioncam cannot be used as a webcam. The prompt you get upon connecting the device via USB lets you probably choose between Mass Storage (UMS) Protocol and Camera (usually abbreviated PTP - Picture Transfer Protocol). 

Both protocols let you transfer pictures from the actioncam to your Mac/PC but neither of those allows the camera to be used as a webcam. That's the reason why it will not show up in any of the mentioned applications in your question.

However, if you have a HDMI capture card or a device to capture HDMI input, you could theoretically capture the output of the actioncam using the HDMI output of the camera on the side. If you don't have such a card you are probably better off just buying a webcam supported by macOS since those HDMI capture cards are more expensive than a webcam.