My cars reverse camera's display break. I can see a mini USB cable was connected to the display. Can I connect my mobile phone to that output using mini USB female to micro USB male jack with any kind of USB streaming app?
What are the outputs from the camera? You could try something like this (from this question) and see if that'd work with an OTG cable. I can't guarantee that it'll work, but it seem like a really fun project to do imo.
However, buying a new screen might be the same price as there are tons on Amazon/Chinese websites
Are you sure the micro USB input to the display, was not just the power instead of actual video
Completely off topic
You can also get a Raspberry Pi / Arduino, accept video signal from camera, plug in a wi-fi dongle, connect with your phone to the IP (within the same network, so make sure you use your Pi/Arduino to host, rather than receive) and stream the video.
Pretty sure you'll have (lots) of delay. So be careful and don't hit anything behind you...
reverse cameras are almost certainly analog signals. That's probably the power cord for it. However if you have an android-based deck, it's possible that it COULD actually be the camera. There are a couple of external av adapters that hook up that way. I have one myself. usb-otg -> digital input device -> camera. People use them a lot when doing heads-up flying of drones but they are also designed for reverse cameras (you can flip the image). In Summary, follow that cable and it may lead to a device with a standard av input.