@RoronoaHemesh said:
Getting the cast & crew members of a particular movie
Is there a way or an API to get the cast and crew of a particular movie with the help of movie ID?

Yes there is. Two methods.

1 Specific API request for Credits (Cast and Crew).
https://developer.themoviedb.org/reference/movie-credits
Example
https://api.themoviedb.org/3/movie/550/credits?api_key=THE_KEY

2 Basic API Request, Details; using the &append_to_response= feature.
https://developer.themoviedb.org/docs/append-to-response
https://developer.themoviedb.org/reference/movie-details
Example
https://api.themoviedb.org/3/movie/550?api_key=THE_KEY&append_to_response=credits

Thanks mate!