Is it legal to put playing basketball in the street in Georgia?

Yes, it is legal UNLESS you have city ordinances saying otherwise (or neighborhood covenants). Go research your neighborhood covenants and city ordinances. These can usually be found at your local courthouse and/or recording office (where property deeds are recorded). If such ordinances or covenants are in place you can complain to city council about it, and to your local homeowner's association.