The White House Correspondents’ Association has put out a series of ideals it hopes the White House will adopt when it comes to access to presidents and their staff. It does address the limited visual access for still and motion photographers:
As a general principle, the White House should not use its own videographers and photographers as a replacement for independent press coverage. When White House photographers and videographers are present, the press pool should be included whenever possible. The press pool should be given the same vantage and access to pooled and open events as the White House photographers and videographers.