Can a fiberglass pool be installed above ground?

Yes you can. And with great results. We had our gunite pool fiberglassed over about 10 years ago. A local company had glassed over several pools in the area including some at motels. We paid about $6500 including all new deck coating. The company used fiberglass mat and resin for the pool and some kind of waterproof resin material for the deck. The deck still looks like new, but I am going to repaint the pool next year.