Finally I capture my first meteor spectrum.
The technique was simply fit a diffraction grating of 100 lines/mm in front of the camera lens, I regulate the lens with focus distance of 8mm so that the spectrum is broadened as possible and UFOCapture software was used to acquire images.
Luckily I got the record of a sporadic meteor bright enough to capture their emission lines, has not yet analyzed the spectrum (blue is closer to the meteor and red at the opposite end).
Camera Watec 902h2 Ultimate
Lens Fujinon YV2.7x2.9LRD-SA2
Diffraction Grating: 100 lines/mm
Locality: São Paulo / Brazil