Jump to time code

A few minutes ago in the virtual SP summit, Marc Mroz wrote "Stream descriptions already support line feeds, links, and hot linking to a time code to jump to the video"

Where can i find more info on the hot linking to a time code?

Is or will this feature be available through clientside scripting to jump to a time code via script?

We would like to build a video feedback application in which users will be able to add timestamps to a video and add feedback to these timestamps. Would it be possible today to use Stream as a backend for encoding, storing and streaming the video while we manage the timestamps and annotations in our databases?

Thanks!