I started off this module planning to use Metaio unity plugin. I completed the first tutorial but after doing lots of reading on forums and Metaio’s tutorials I couldnt changed the tracking image.
So after having a think about if I should carry on with the Metaio plugin or find an alternative. I found a plugin call Vuforia a really nice plugin with out a water mark and the tracking data is worked out on there cloud system then allows a simple Unity package to be downloaded. It also evaluates how well your reference image will be track able.