A good few years ago, this was my quick way of stitching an video with PTGUI and Hugin. Requires Hugin, a project file for one of the frames and FFMPEG.

extract.bat

ffmpeg -i GOPR0011.MP4 -f image2 GOPR0011/GOPR0011_%3d.jpg
ffmpeg -i GOPR0012.MP4 -f image2 GOPR0012/GOPR0012_%3d.jpg
ffmpeg -i GOPR0015.MP4 -f image2 GOPR0015/GOPR0015_%3d.jpg
ffmpeg -i GOPR2943.MP4 -f image2 GOPR2943/GOPR2943_%3d.jpg
ffmpeg -i GOPR8717.MP4 -f image2 GOPR8717/GOPR8717_%3d.jpg
pause

stitch.py

import os
import os.path

numFiles = 4892

for i in range(1, numFiles):
    paddedNumber = '%03d' %i
    paddedNumberExtra = '%04d' %i
    os.system('"C:/Program Files (x86)/Hugin/bin/nona.exe" -o temp projectfile.pto GOPR0011/GOPR0011_'+paddedNumber+'.jpg GOPR0012/GOPR0012_'+paddedNumber+'.jpg GOPR0015/GOPR0015_'+paddedNumber+'.jpg GOPR2943/GOPR2943_'+paddedNumber+'.jpg GOPR8717/GOPR8717_'+paddedNumber+'.jpg')
    os.system('"C:/Program Files (x86)/Hugin/bin/enblend.exe" --no-optimize -o stitched/output_' + paddedNumberExtra + '.jpg temp0000.tif temp0001.tif temp0002.tif temp0003.tif temp004.tif')