You can capture side by side footage and create a stereoscopic clip.
To capture side by side material as a stereo clip:

This creates a single clip with a stereo track, with the material half the horizontal resolution of the original footage. The left half of the footage is the Left eye, and the right half of the track is the Right eye.

To capture side by side material as a stereo clip and resize it to full resolution:

The filters go from Triangle (low quality) to Lanczos (high quality). The default is Lanczos, but if there are dropped frames during capture, you will need to use a lower quality filter to get perfect capture.
This creates a single clip with a stereo track, with the material resized to the full horizontal resolution of the original footage. The left half of the footage is the Left eye, and the right half of the track is the Right eye.

EDL Capture of Side by Side Footage
If you import an EDL referencing stereoscopic footage recorded as side by side images, and if you use the Dual Image - Slice option in the EDL Import module, the events might not relink to the captured material; this requires you to set a custom resolution.
To set a custom resolution for the captured material in the EDL module: