It is not something you might want to do every day but it is possible. It could be useful say if you had a rig for gigapans that rotated the DSLR steadily and fired shots at a constant interval but was not NPP. Or if you wanted to use L/R slice assembly from an off-axis single camera for stereo panoramas.
eg. Have an accurate (!) intervalometer (I use Pclix) that fires the DSLR say at 0.4 second intervals. Have the Gopro shooting at 30fps say. Have the Gopro attached and next to the DSLR but in a NPP postion. In a video program you will see the sound track spikes of the Gopro video corresponding to the DSLR shutter/mirror noise. Every 12 (0.4*30) frames exactly the spikes will recur. So if you decimate the video by a factor of 12 starting with the first synced frames you have video frames that correspond (with a constant offset less than 1/60th second to the DSLR frames. Now if the motion of the rotation is primarily simple approximately level rotation it means you can calibrate the DSLR frames accurately with the Gopro frames.