- Just one capture session per input component.
- Avoids starting/stoping capture during collection reloads, which can make the live camera take longer to capture or even hang.
- Moves creation/destruction of capture session to the background: when opening/closing the input component many times it was resulting in capture start / stop blocking the main thread for some seconds on iOS 8
- Queues updates in the collection view: doing a reloadData right after reloadItemsAtIndexPaths (update video) results in the visible cells not being refreshed