query AssetCommentsMarking {
  asset(id: "…") {
    comments(limit: 25, page: 1) {
      items {
        marking {
          ... on VideoMarking {
            __typename
            dimensions {
              height
              width
            }
            position {
              x
              y
            }
            timeframe {
              end
              start
            }
          }
        }
      }
    }
  }
}