Embedding a channel in your video tag will allow viewers to toggle through multiple interactive images within a video tag.
First go to the channel that will be embedded in the video. View the channel in slideshow mode. In the upper right of the slide show select the share button and copy the embed code.
Navigate to the video and add a new tag at the time point the tag should appear. In the link field paste the embed code of the channel. Save the tag.
When viewers click on the tag, the channel will appear live in the open tag.