shotstack-chromakey.json

{
    "timeline": {
        "tracks": [
            {
                "clips": [
                    {
                        "asset": {
                            "type": "video",
                            "src": "https://shotstack-assets.s3.amazonaws.com/chromakey/leon.mp4",
                            "chromaKey": {
                                "color": "#009043",
                                "threshold": 160,
                                "halo": 100
                            }
                        },
                        "start": 0,
                        "length": "end"
                    }
                ]
            },
            {
                "clips": [
                    {
                        "asset": {
                            "type": "video",
                            "src": "https://shotstack-assets.s3.amazonaws.com/footage/hot-air-balloons-1.mp4"
                        },
                        "start": 0,
                        "length": "auto"
                    }
                ]
            }
        ]
    },
    "output": {
        "format": "mp4",
        "resolution": "hd"
    }
}