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How can I use a mask in Nero 2015?

So I often watch Sony Vegas a Premiere tutorials and many of them use something called mask like in photoshop and gimp. Where is this funtion and how can i use it? I only found this effect "Ajuste Alfa" translated as alpha adjustment where I can read "Mascara" aka mask, but it only makes the screen go black.
Could anyone help me?
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