How to "process a video" to find the velocity(d​isplacemen​t/time) of a crack tip

hi Dears i am working on DCB specimen to find the crack tip velocity. so we have a film like this link and crack starts to initiate and propagate in model like film. so i want to process it with MATLAB. i know it is a little hard, but i should do it. please see this video and this article.i want to do something like that. https://www.youtube.com/watch?v=ob-3Coej8rs https://i.ytimg.com/vi/ob-3Coej8rs/maxresdefault.jpg https://www.researchgate.net/profile/F_Lahuerta/publication/261795370_Automated_delamination_length_video_tracking_in_static_and_fatigue_DCB_tests/links/549284660cf2991ff556110f.pdf?origin=publication_list please help me------thank you