This bracket is for mounting an ESP32-Cam microcontroller in a bird nesting box. There are fixtures for 5mm LEDs. I use infrared LEDs, so the camera can be used in the dark without visible light. However, this requires a small modification of the ESP32 cam lens. I explain what you have to do for this among other things in this Youtube video:
https://www.youtube.com/watch?v=OeogSzLhRLk

I use the standard lens for my nest box, so I don't need a fisheye lens. The vertical distance of the lens from the nest should be about the width of the footprint to be captured. So about 100 mm if the base area of the nest box is about 100 x 100 mm.