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                                     _________________________
                                    |                         |
                                    |          room           |
                                    |_________________________|
                                                 | 1
                                                 |
                                                 |
                                                 | 1..n
                                     ____________|____________
                                    |                         |
                                    |          scene          |
                                    | ------------------------|
                                    |   boundary              |
                                    |   name                  |
                                    |_________________________|
                                        | 1            | 1
                                        |              |
                                        |              |
                                        | 0..n         | 0..n
                  ______________________|__      ______|__________________
                 |                         |    |                         |
                 |    capture device       |    |     render device       |
                 |                         |    |-------------------------|
                 |_________________________|    |   TBD                   |
                           | 1       | 1        |_________________________|
                           |         |
                           |         |
                           | 0..n    |
     ______________________|__       |
    |                         |      |
    |     captured audio      |      |
    |-------------------------|      |
    |   TBD                   |      |
    |_________________________|      |
                                     |
                                     |
     _________________________       |
    |                         |      |
    |      video stream       |<-----|------------+
    |                         | 1..n |            |
    |_________________________|      |            |
              |                      |            |
             /\                      |            |
            /  \                     |            |
            ----                     | 0..n       |
              |     _________________|_______     |
              |    |                         |    |
              |----|     captured video      |    |
              |    |-------------------------|    |
              |    |   focus                 |    |
              |    |   boundary              |    |
              |    |_________________________|    |
              |                                   |
              |     _________________________     |
              |    |                         |    |
              |----|     switched video      |----+
              |    |-------------------------|    |
              |    |   algorithm             |    |
              |    |_________________________|    |
              |                                   |
              |     _________________________     |
              |    |                         |    |
              +----|       mixed video       |    |
                   |_________________________|    |
                                |                 |
                                |                 |
                                | 1..n            |
                    ____________v____________     |
                   |                         |    |
                   |       video mixin       |----+
                   |-------------------------|
                   |   x-range               |
                   |   y-range               |
                   |_________________________|