Since you rpreetipj are a 'fresher' with little experience with hands on Voita will be of no use what so ever for you. First get some proper experience before you are reaching for the skies. Voita is an extremely hands on technique and the assessment is no exception! To become a Voita trained phyio you do not just look at some video. The training might take (at least) 4 years. Start with doing some proper observation and think what you actually see. Look at normal posture, movement patterns and adnormal patterns then when you start to undertand the difference and have asked yourself why there are differences, go for the skies. learn to walk before you intend to run. A good start would be an introduction course of Wikipedia reference-linkbobath or a neuro development course (on children). But it is great to see your enthousiasm.
Cheers.