Create a storyboard for the basic film plot. Choose the LEGO actors and objects to animate in the film, and write down any notes for their desired roles in the stop-action film.
Shoot the film frame-by-frame. Set the camera on the tripod, and do not move the camera until every frame from the scene has been captured. Move the LEGO pieces during each frame to simulate motion after the frames are combined. To keep the motion smooth, plan to shoot about ten frames for every second of film.
Download the photos to your computer, and load them in the video-editing software of your choice.
Animate the LEGO pieces by combining the photos using the photo software. Select the amount of time for each photo to appear on the screen. Most films are captured at about 30 frames per second, so ideally three frames per photo--or ten photos per second--should suffice for an accurate stop-action effect.
Add music, captions and other frames to the final product using the video software of your choice to complete the LEGO film.