How to inject power to POE IP camera

Experts, I will explain my situation with depth. I have a re-branded Hikvision 8 channel NVR. One of the cameras I have is shown in the photo jidetech_camera.jpg enclosed. It simply stopped working. It shows as drawing no current as displayed using the NVR application. Occasionally it will tell me that the problem is "resistance is too low". I wanted to do some tests with the cam disconnected from the NVR and simply plugged into the router. Looking at all the advice I have been given it seems like a bad idea for me to go further with my troubleshooting without a new injector. I did move the cam to a different port on the NVR but with the same results. Neither the green or the orange light illuminates. The cam was just installed two months ago and has worked flawlessly since. I will order a splitter/injector for possible future needs. As for my present problem, I will let the manufacturer  deal with it. Thanks so much Experts!!

P.S. Experts, since you can see the camera I am dealing with, can anyone suggest a splitter/injector on Amazon that would be good to use with this camera?

something on the line of TP-Link TL-PoE150S Gigabit PoE Injector Adapter, IEEE 802.3af compliant, Up to 100 meters (328 Feet): Amazon.ca: Electronics  will work for you