Para se qualificar para o Filhos dos homens, um filme que apresenta várias seqüências longas de tiro único, eles construíram uma plataforma extensa em cima do carro e também modificaram os assentos do carro para que os atores que não estavam na tela pudessem sair do caminho da câmera.
De acordo com a a página da Wikipedia do filme:
Cuarón's initial idea for maintaining continuity during the roadside
ambush scene was dismissed by production experts as an "impossible
shot to do". Fresh from the visual effects-laden Harry Potter and the
Prisoner of Azkaban, Cuarón suggested using computer-generated imagery
to film the scene. Lubezki refused to allow it, reminding the director
that they had intended to make a film akin to a "raw documentary".
Instead, a special camera rig invented by Gary Thieltges of Doggicam
Systems was employed, allowing Cuarón to develop the scene as one
extended shot. A vehicle was modified to enable seats to tilt
and lower actors out of the way of the camera, and the windshield was
designed to tilt out of the way to allow camera movement in and out
through the front windscreen. A crew of four, including the director
of photography and camera operator, rode on the roof.
É claro que isso é melhor explicado visualmente, e eles o fizeram em um dos extras do DVD / Blu-ray chamado "Under Attack":
Mas essas cenas de ação de tiro único ainda são compostas de vários tiros. Citando novamente a página da Wikipedia do filme:
However, the commonly reported statement that the action scenes are continuous shots is not entirely true. Visual effects supervisor Frazer Churchill explains that the effects team had to "combine several takes to create impossibly long shots", where their job was to "create the illusion of a continuous camera move." Once the team was able to create a "seamless blend", they would move on to the next shot.
[...]
the car ambush was shot in "six sections and at four different locations over one week and required five seamless digital transitions"