Disabling Player Controls:

There are 2 ways in disabling player controls, First: do what Hungrayjaffer suggested, set the player's Walkspeed to zero, or disabled the controls by accessing the ControllerService service.

local control = game:GetService("ControllerService"):GetChildren()

for _, controller in pairs(control) do
    controller.Parent = nil
end

This removes the player's control, but how do we return the control back? Easy, return the ControllerService back to it's place.

local EmptyTable = {} -- Create a table to store the values in

function Remove()
    for _, controller in pairs(game:GetService("ControllerService"):GetChildren()) do
        controller.Parent = nil
        table.insert(EmptyTable, controller)
    end 
end

function Go()
    for _, controller in pairs(EmptyTable) do
        controller.Parent = game:GetService("ControllerService") -- Put the controller back into ControllerService
    end
    EmptyTable = {} -- Remove the Array's values.
end

Remove()
wait(5) -- wait 5 seconds then return the controls.
Go()

I know TheContinentOfEurope answered but I found a much more simpler way: Using the ControllerScript in PlayerScripts! This is a local script inside of it, call the function "Stop" then do the function "Resume" to make the person stop then be able to control again.

Final Product

--LocalScript
local control = script.Parent:WaitForChild("ControllerScript")
function Stop()
    control.Parent = nil
end
function Resume()
    control.Parent = script.Parent
end
Stop()
wait(5)
Resume()

Hope it helps!

The answer you are looking for is this: Roblox updated their control stuff to modules. Player > PlayerScripts > PlayerModule

Now if you want to disable movement, you'd have to use the disable method built into the ControlModule that's a child of PlayerModule. I suggest doing this in a loop due to the fact that not doing so is buggy and sometimes doesn't work. You would do so like this:

local MasterControl = require(game.Players.LocalPlayer:WaitForChild("PlayerScripts"):WaitForChild("PlayerModule"):WaitForChild("ControlModule"))

game:GetService('RunService').RenderStepped:connect(function()
    MasterControl:Disable()
end)

And then you'd renable it by using the Enable method instead of disable.

As for the camera, you'd just make it scriptable and cframe it where you want it.

local MasterControl = require(game.Players.LocalPlayer:WaitForChild("PlayerScripts"):WaitForChild("PlayerModule"):WaitForChild("ControlModule"))

game:GetService('RunService').RenderStepped:connect(function()
    MasterControl:Disable()
    workspace.CurrentCamera.CameraType = Enum.CameraType.Scriptable
    workspace.CurrentCamera.CFrame =             game.Players.LocalPlayer.Character:WaitForChild('HumanoidRootPart').CFrame * CFrame.new(0,1.5,0.1)
end)