This Video on-Demand is the recording of a live broadcast with remote simultaneous interpretation using Translate@Home. It was broadcast with OBS Studio and ingested, live streamed and recorded by Clevercast. Other encoders can be used, including SRT encoders that send multiple audio tracks.
The multilingual live streaming works in the same way as the video on-demand. See this demo of a live stream with multiple audio languages and closed captions.
Press the headset menu to change the language in the player below.
Video fragment from Sintel by the Blender Foundation.