How to measure crack speed of DCB model"carck tip" in matlab?

[sabuy]

Hi dears

i have a DCB model. i captured 16 seconds film under loading(you can search DCB model). so the crack initiate and propagate in the DCB specimen.

now i want to calculate the speed of crack tip. can you help me?

is there any software that can do it for me? some body advises me to use image processing in Mathlab or other software... what do you think?
should i write a code for it?
Can i change a RGB film to binary film in matlab? how can find the position of a crack tip in Matlab?
please see this film and image:

https://i.ytimg.com/vi/ob-3Coej8rs/maxresdefault.jpg

https://www.youtube.com/watch?v=ob-3Coej8rs

thank you