@aikia
Sorry for the late reply. I'm quite busy these days. I'm using analogue DAHUA cameras 2MP with colour and night mode, manual or automatic setting for gain, exposure and shutter (this is an important feature, since you really don't want to have automatic exposure changes when you're trying to track something) and a zoom of 2.7 to 13mm which is great to be more flexible to place the cameras (I get as far as 25m from stage. I track using infrared (night mode) and reflective 3M wear on the dancer, and increase the shutter so I only see the reflection and anything else is black.
When I'm very far away I've used a cheap IR flood light to improve reflectance. It does not interfere with the video, nor the video with the camera.
The model of my camera is: DH-HAC-HFW2241TUP-Z-A
These are common bullet cameras, but If I was to get new ones I'd probably go for the PTZ (not sure if those have night mode). I use them in CVI mode and usually have a 25m coax running to the DVR.
The DVR model is also from DAHUA and I can connect 4 cameras to it and view them either in full res 1080 or a split screen with all cameras at the same time at 720.
Model DH-XVR4104C-X1-BL.
I had some issues with my BM-shuttle not recognising the res/freq combination output of the DVR so I had to output at 720. But still fine.
And that's it pretty much.
Cheers