import time
from selenium import webdriver
from selenium.webdriver.phantomjs.service import Service as PhantomJSService
from selenium.webdriver.common.action_chains import ActionChains
driver = webdriver.PhantomJS(executable_path='/patch/phantomjs')
driver.get(url)
print driver.get_window_position()
action = ActionChains(driver)
time.sleep(5)
action.move_by_offset(300,300)
print driver.get_window_position()
driver.quit()

 {u'y': 0, u'x': 0}
{u'y': 0, u'x': 0}