The Eufy app would have to expose a ‘deep link’ or special intent URL to open a specific camera. Unfortunately most apps don’t do that or at least don’t document it well. You could try reaching out to Eufy to ask, but fair warning that it’s a long shot.
–
This is well into the ‘tinkerer’ category, but in theory you could do it with an automation app like Tasker depending on what type of tablet it is. Here’s an example triggering a Tasker Profile from a Hyperlink Tile in SharpTools. It’s definitely a Rube Goldberg approach to things where you would have Tasker automate opening the Eufy app and then performing the ‘taps’ on the screen to start the playback.
Note: The Tasker developer does not officially support Fire Tablets, but it is available on normal Android tablets.
I don’t know if AutomateIt, the closest equivalent to Tasker on Fire OS devices supports the various features/plugins that Tasker does to enable this (eg. Autoinput for a special URL to trigger the Profile and being able to simulate device touches)