Convert Video To Gif Via API

{
    "timeline": {
        "background": "#000000",
        "tracks": [
            {
                "clips": [
                    {
                        "asset": {
                            "type": "video",
                            "src": "https://shotstack-ingest-api-v1-au.s3.ap-southeast-2.amazonaws.com/62hne3bb81/zzyb58zg-3s0j-440g-hf9o-0hvxy73joauh/source.m4v",
                            "trim": 3
                        },
                        "offset": {
                            "x": 0,
                            "y": 0
                        },
                        "position": "center",
                        "length": 4,
                        "start": 0
                    }
                ]
            }
        ]
    },
    "output": {
        "size": {
            "width": 250,
            "height": 250
        },
        "format": "gif",
        "repeat": true,
        "quality": "low",
        "fps": 12
    }
}