The ghost notes in this groove are 16th notes and are on the ‘a’ of 2 and the ‘e’ of 3. The second open hi-hat in the groove is on the ‘&’ of 3 and is played in unison with a bass drum- this involves your right foot going down at the same time as your left foot is coming up. You will probably need to practice that specific technique on its own first before being able to play the complete groove. Take your time with it and have fun!