Hi Mourougan,
There is no support, that I am aware of, for Velocity in Grails.
The only benefit I can think of for using a separate templating language for the view, e.g. Velocity or Freemarker, is that you can
test the views without running the entire application. However, if I wanted to unit test the views I would rather use
Java or Groovy code than a template language.
After a quick Google I think it is more likely that freemarker will be supported before velocity, if either of them are on the plan.
Cheers,
Jon.