This passion I got for photography does not come from nowhere there is personal reason but also a technical one: One I played with cameras when I was making simulation I was wondering how all these things work in real life and how they made it possible in Unreal.
The Cinema Camera from Unreal Engine let the user choose a focal length and has many settings similar to a real camera, here, we need to modify the code of the actor a little or make a blueprint to have a Dolly Zoom in your game.
What is a Dolly Zoom: To know what is a dolly zoom: https://youtu.be/zjKNZ1ydE9I?t=20
To perform it we need the camera to move close to the subject while the focal is getting wider and wider. To have a value between 0 and 1 that is redundant I use a cosinus value over the time for the distance and focal length.
Then you should expect this result: