You can do it like this:
Python script:
import clr
#Import the Revit API
clr.AddReference('RevitAPI')
import Autodesk
from Autodesk.Revit.DB import *
elem = UnwrapElement(IN[0])
output = []
params = elem.Parameters
for i in params:
pg = i.Definition.ParameterGroup
if str(pg) == 'PG_VISIBILITY':
output.append(pg)
OUT = output