multicam-composite meemoo app -- https://app.meemoo.org/#gist/e8adf587ca597b284c68cc2a3684d72f

multicam-composite.meemoo.json

{
  "info": {
    "title": "two cameras and a composite image",
    "author": "forresto",
    "description": "inside you there are two wolves, and two webcams, and composite mode...",
    "url": "multicam-composite"
  },
  "nodes": [
    {
      "id": 4,
      "src": "meemoo:image/cam",
      "x": 488,
      "y": 204,
      "w": 260,
      "h": 349,
      "state": {
        "width": 500,
        "height": 500,
        "fps": 30
      }
    },
    {
      "id": 5,
      "src": "meemoo:image/cam",
      "x": 97,
      "y": 106,
      "w": 268,
      "h": 350,
      "state": {
        "width": 500,
        "height": 500,
        "fps": 30
      }
    },
    {
      "id": 6,
      "src": "meemoo:image/transform",
      "x": 869,
      "y": 95,
      "w": 517,
      "h": 520,
      "state": {
        "width": 500,
        "height": 500,
        "scale": 1,
        "translateX": 0,
        "translateY": 0,
        "rotate": 0,
        "composite": "darken",
        "smoothing": "true"
      }
    }
  ],
  "edges": [
    {
      "source": [
        4,
        "stream"
      ],
      "target": [
        6,
        "background"
      ]
    },
    {
      "source": [
        5,
        "stream"
      ],
      "target": [
        6,
        "image"
      ]
    }
  ]
}