Sorry if the explanation below is terrible, I tried to make it as simplistic to understand as possible. I’ve also shown the script in case there was anything I needed to change or add-on to it.
So I’ve made a local script where your camera snaps either left or right depending of which GUI your mouse hovers over (i.e. if your mouse hovers over a GUI on the left, your camera snaps to the left, etc) , sort of what you would see in FNAF 6’s office.
I want there to be some kind of smooth camera movement between two camera parts instead of them snapping but after hours of research, nothing worked.
If anyone could help me with this, that would be great! 
Script for the the camera parts:
local Player = game.Players.LocalPlayer
local Character = Player.Character or Player.CharacterAdded:Wait()
--
local Camera = workspace.CurrentCamera
--
local LeftButton = script.Parent.LeftButton
LeftButton.Active = true
local RightButton = script.Parent.RightButton
RightButton.Active = true
--
repeat wait()
Camera.CameraType = Enum.CameraType.Scriptable
until Camera.CameraType == Enum.CameraType.Scriptable
Camera.CFrame = workspace.FrontCamPart.CFrame
--
LeftButton.MouseEnter:Connect(function()
Camera.CameraType = Enum.CameraType.Scriptable
if Camera.CFrame == workspace.FrontCamPart.CFrame
Camera.CFrame = workspace.LeftCamPart.CFrame
elseif Camera.CFrame == workspace.RightCamPart.CFrame then
Camera.CFrame = workspace.FrontCamPart.CFrame
end
end)