For the person asking about 'the action style'

[thelaughingduck2001]

I can't remember whether this was said or not, but I believe you sid 28 Days Later used this technique. Well, this was something I found-

Often, DV has been used for small, improvised character pieces, which only made these films feel tedious and amateurish. In the hands of a gifted director with something to prove, 28 Days Later illustrates all of DV's strengths without the problems. As with The Celebration, 28 Days Later possesses a verite immediacy that conventional film cameras would have only made pretty and plain. Because DV is shot at 30 frames per second -- rather than film's 24 frames per second -- a movie made on digital video always appears slightly, well, different or foreign to our eye. This uneasiness with the image is essential to 28 Days Later's specific design. Even when our heroes aren't being attacked, DV's eerie, washed-out sickness creeps into our skin, jitters our nerves.

[windowslaws]

did they shoot on ntsc cameras then?

[jungleguy]

DV is not necessarily 30fps (29.97 if you want to split hairs)