Am I a Candidate of Invisalign if I Have Gum Recession with Widening of Smile?

As long as gum disease is under control, you should be fine with doing orthodontics, however I would suggest a consultation with a periodontist.  It is likely that treatment should be done, perhaps before braces, perhaps after.  I recommend going for the most ideal orthodontic result as well as dealing with the periodontal (recession) issues.

Recession can be a serious problem that can lead to tooth loss in the long term.  Recession exposes root surface which is much more susceptible to cavities than the crown of the tooth which is covered by enamel.  To fix recession areas we use tissue grafts, the gold standard of which is taking autogenous tissue (from the roof of your mouth) and attach it underneath the adjacent gum and over the exposed root surfaces.  Recesion is ideally treated before you begin orthodontics.  If you have access to a few good gum specialists I would get a few consults and see what they have to say.before beginning orthodontics. 

It is hard to make a recommendation without seeing pictures of your moth and having more information about your situation.  However, in general. I think periodontal health is more important than an absolutely perfect bite.  Better bites usually beget better gum (periodontal) health. But, even excellent bits can suffer recession.  I would go with protecting the periodontium (gums) as the primary goal and then protecting the bite or alignment as second priority.

Hope this makes sense,