I, too, am trying to get a live "webcam" view on my Android device. My phone is a Motorola Droid Turbo, running Android 6.0.1 I purchased this OTG cable, thinking that it would be all I need:
https://www.amazon.com/gp/B01GH0XP3A
However, when I installed "Mobius ActionCam", the camera is not detected. Can you post a link to a known, working OTG cable? TonyM spoke of a "data cable" vs a "charging cable". What is the difference? How do I know which I have? The camera came with a cable with a mini-B plug on one end, and a type-A plug on the other. That cable works both to charge the camera, and to connect it to my computer for use as a webcam, and also as a peripheral storage device. The Mobius documentation says that the cable must have pins 4 and 5 shorted together to make an A/V out cable. Is that a mod I have to do myself? I'd rather not rip the plugs apart if I don't have to. Is it possible to connect to an Android phone as a webcam, without using a shorted cable?