I assume that is it a reaction of methane with a nickel oxide-supported catalyst, over a fixed bed downflow reactor, where we can obtain carbon nanotubes as well as hydrogen.
the basic definition of CVD process is "in which thermal decomposition of a hydrocarbon vapor is achieved in the presence of a metal catalyst'. it is also known as thermal CVD or catalytic CVD. it means that a good variety of hydrocarbons and catalysts are used in this process.
you can find a good review as given link below
Journal of Nanoscience and Nanotechnology Vol. 10, 3739–3758, 2010
Although Shama's answer matches most cases, actually neither is a catalyst necessarily involved, nor are hydrocarbons the only possible gases that can be used for the deposition.
If you are simply asking what chemical vapor deposition methods are used to prepare nanomaterials, there are numerous options - among them ALD (Atomic Layer Deposition, sometimes called Atomic Layer CVD) which is one of the methods that are the most highly focused on nanomaterials.
However, if you are asking for the name of the method you are using in your specific example I would agree with Shama Parveens answer above that "catalytic CVD" is the most descriptive name for your method.