How can i create in unity3d or blender a eyeball camera for a drone ?

I can’t find any tutorial either in unity3d or blender.
I want to add to my drone in the bottom a camera that will rotate 360 degrees and then i will use the unity3d camera to look through it. But how can i model the camera first ?

If you are talking about a 3D model of a camera you will need to learn how to model it yourself or find one already made that fits your needs. You can try , or any other 3D models website.

If you are talking about how to model that camera, I would suggest modeling the fixed part of the camera, then you create the moving part of the camera like a sphere and put it as a child of your camera so that it follows its rotation. I’m thinking something like this