Hello @jackkoumi,
Yes. The Kaltura platform fully supports the addition of captions [in multiple languages] to video assets. Using the API, it is possible to search for specific strings within the caption assets.
You can see a demo of that here:
If you input “you can also toggle” in the search box, you will get the following result:
00:30 - [English] You can also toggle between the video and slides to switch their locations.
https://portal.mediaspace.kaltura.com is running Kaltura MediaSpace which makes use of the Kaltura APIs in order to achieve its goals. It is important to note that MediaSpace itself is NOT FOSS. However, you can build the same user experience yourself by installing the Kaltura Community Edition [CE] and using our APIs to create your own video portal.
If you’re interested in registering for a free trial of MediaSpace, please see:
https://corp.kaltura.com/products/video-for-business/kaltura-mediaspace-video-portal/free-trial/