Depending on your definition of CGI you might want to include the FX shots in the original Star Wars. While the shots were based on model photography and blue screen shooting, which are not very revolutionary or technological, they used computers to track the camera movements and count the number of frames so that the different items in the scenes could be integrated seamlessly. It allowed them to replicate camera timing and movement for all the elements in an FX shot so that when the elements were combined you could not tell that the elements had been shot separately. This as far as I know was the first use of microprocessor technology in special effects shots!
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Depending on your definition of CGI you might want to include the FX shots in the original Star Wars. While the shots were based on model photography and blue screen shooting, which are not very revolutionary or technological, they used computers to track the camera movements and count the number of frames so that the different items in the scenes could be integrated seamlessly. It allowed them to replicate camera timing and movement for all the elements in an FX shot so that when the elements were combined you could not tell that the elements had been shot separately. This as far as I know was the first use of microprocessor technology in special effects shots!