Is it possible to use a Ubiquiti PoE Injector for the Hikvision Camera?

the TP-Link TL-POE150S - will this be appropriate ?
Yes, that will work OK, it has the right specs, enough power for your camera, which is quite low for a speed dome.

But, strictly, you don't need a Gigabit ethernet connection, so you could save a little with a 10/100Mbps device instead.
Or play safe and get a higher power 802.3at PoE injector just in case you swap out the camera for a bigger one sometime.