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If you need to only stabilize a 360 VR shot, you can do that relatively simply in the image preprocessor using a 2.5D-type technique, rather than a full 3D solve. The drawback is that longer shots can drift, though you can easily hand-animate corrections or art direction.
Open the shot, selecting the 360 VR mode of "Present."
On the Summary panel, click Run Auto-tracker.
Use shift-lasso while scrubbing through the shot to select all the distant trackers, ie by the horizon line. Don't select any independently-moving trackers, such as those on vehicles.
(If there aren't many trackers to select, start over but go to the Advanced tab on the Features panel and increase the number of trackers per frame to 60 or more and the maximum tracker count to 300, 500, or more depending on the length of the shot; then rerun the Auto-tracker).
Open the Image Preprocessor (hit the P key)
On the Stabilize tab, click Get Tracks.
Change the two Stabilize Axes dropdowns to either Peg or Filter. Peg stabilization causes the initial orientation to be maintained; Filter does that, controlled by the Cut Frequency spinner.
To examine the stabilization, scrub through the shot using the spinner at bottom of the image preprocessor.
You can adjust the aim direction of the stabilized image using the spinners on the Adjust tab. (Note that these spinners and the Filter frequency can be animated by first turning on the add-key button at lower right of the image preprocessor window.)
To have the trackers match up with the modified footage, click Apply to Trkers on the Output tab before closing the image preprocessor. If you modify the stabilizer settings later, you must hit Remove f/Trkers before doing so.
You can close the image preprocessor and experiment and play back the shot in the main camera view.
Once the shot is ready, reopen the image preprocessor, go to the Output tab, and click Save Sequence.
Or, use the exports to AfterEffects or the generic Save Sequence approach.
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