It's not possible that you got that straight from the wiki since the wiki page looks like this

Your Problem

• 1) You didn't define Interpolate.

  The Interpolate function is a function of Camera. You need to use it as a method from camera.

• 2) Your 1st, and 2nd arguments are the wrong datatype!

  The 1st and 2nd arguments of the Interpolate function should be CFrames. You provided Vectors. To provide a CFrame, index the CFrame property of the character's torso, rather than the Position property.

Code

local cam = workspace.CurrentCamera --Define the camera
local plr = game.Players.LocalPlayer --Define the player

cam:Interpolate(
    plr.Character.Torso.CFrame, --Index 'CFrame' property
    plr.Character.Torso.CFrame,
    1
)

NOTE: Make sure this is a localscript in somewhere that replicates to the client. e.g. ReplicatedFirst, StarterPack, StarterGui.

Interpolate is a Method from a camera. This must be with a local script and, the camera type needs to be scriptable(also needs to be done in a local script).

Camera

Camera is an object in workspace and it affects the camera in the game for a player on the client. You need to set the camera type to scriptable.

--LocalScript
local camera = workspace.CurrentCamera --Or Camera
camera.CameraType = Enum.CameraType.Scriptable

Interpolate

It is a method, use it on the camera object

camera:Interpolate()

Final Product

local camera = workspace.CurrentCamera --Or Camera
camera.CameraType = Enum.CameraType.Scriptable

camera:Interpolate(
    game.Players.LocalPlayer.Character.Torso.CFrame,
    game.Players.LocalPlayer.Character.Torso.CFrame,
    1
    )

Hope it helps!