Yes, it's detachable. 

Yes, the hunting camera comes with a solar panel with a 3m cable, the solar panel can be adjusted to suit the location and How do you get the electricity? How much capacity does the hunting camera have The product itself has a battery capacity of 7800mAh and is powered by the solar panel. Please fully charge it with the adaptor before use. You do not need to remove it often to charge it in summer and in sunny places 

Yes, you can. 

You can use the gimbal as a simple 3 axis stabilizer for your phone without using the app. So just use your normal phone app at whatever resolution you need. My V60 does 8k video. 

Our tripod is 1/4 size quick release plate, 3/8 size gimbal interface size, you can check with your blackmagic pocket cinema camera 4K screw that it will fit for it or not.