The most recent winners of the Oscar for best visual effects were Joe Letteri, Stephen Rosenbaum, Richard Baneham and Andrew R. Jones for their work on Avatar. See related links to see a list of past winners.
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No Indian movie has ever won an Oscar, so no. He received his Honorary Oscar for his body of work.
The 1995 Academy Award for Best Cinematography was presented to John Toll for his work in "Braveheart." It was Toll's second consecutive Oscar win in the category. He won the 1994 award for "Legends of the Fall."
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Companies no longer win an Oscar, people win for their work in motion pictures.
HR Giger was recruited by director Ridely Scott to design both the alien and its environment in the movie. The special effects team, which Giger was a part of, won an Oscar for Best Achievement for Visual Effects for the design work they had done on the film.
Nobody won an Oscar for the movie, but Leonardo DiCaprio was nominated for the "Best Actor in a Supporting Role" Oscar for his work in the movie.
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Computer science professor Patrick Hanrahan has won an Oscar for his work in computer graphics.
Walter Plunkett won an Oscar for Best Costume Design, Black-and-White for his work on the film The Actress(1953)