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It's about 18x14x10 cm.
It would look fairly obvious but I always thought that was the main point of a security camera? The recording is frequently of no use after the event and they aren't often monitored.
Apparently this fake camera has enough space inside for a Pi Zero and camera but it might require some effort to mount the camera - https://www.amazon.co.uk/WALI-Surveillance-Security-Outdoor-Warning/dp/B06Y4FJD33/
Naturebytes?
https://thepihut.com/products/naturebytes-wildlife-camera-case