Grandfather paradox and Movies

Grandfather paradox is a type of paradox which essentially means that suppose if a person name A gets a chance to time travel to  his/her past and if he/she kills his/her grandfather then his/her mere existence is impossible.Hence it is a contradiction.Tenet which is eleventh feature of master director Christopher Nolan uses this concept .But the best example is the movie predestination which released in 2014 which uses this concept beautifully and describes that essentially this paradox is actually a never ending or infinite loop.