CaptureSpace uploads the videos to the Kaltura Server. The Kaltura Server allows you to search through the video metadata [name, description, tags, captions, etc] as well as create custom metadata profiles if you need more customised metadata fields. Searches can be made from the KMC and Kaltura MediaSpace [KMS] as well as directly using the API so you can integrate these capabilities into your own applications.
If you're interested in learning about our API, see https://developer.kaltura.com and in particular, https://developer.kaltura.com/recipes/video_search# and https://developer.kaltura.com/recipes/metadata#.
As for interactiveness, the Kaltura player has many interactive plugins, just to provide a few examples: the quiz plugin will allow you create quizzes to be displayed during playback [see demo here https://videos.kaltura.com/media/Interactive+Video+Quiz+%E2%80%93+Settings/0_k6gt5uzg/4061861], you can also create call for actions [see demo here player.kaltura.com/modules/CallToAction/tests/ActionButtons.qunit.html], for a short video about additional interactive features, see https://videos.kaltura.com/media/Kaltura+Interactive+Video+Player/1_pdxvb3ug/4143331