All that would be needed is this.

When the actors play the scenes, not a single but a double camera would have to take the pictures.

Such a double camera focuses the scene from two different points of view, corresponding to the position of the two eyes.

Both films are then to be projected on the screen at the same time by a double projection apparatus which secures complete correspondence of the two pictures so that in every instance the left and the right view are overlapping on the screen.

This would give, of course, a chaotic, blurring image.