Pickers - Location
This plug-in allows to easily find and select a location on the Google map. Along with a single point selection, it allows to choose an area by providing its center and the radius. All the data can be saved to any HTML input element automatically as well as be processed by Javascript (callback support).
If you need direct access to the actual Google Maps widget you can use map method as follows. This example illustrates how to set zoom pragmatically each time when location has been changed.