From the YouTube page:
This may be the smallest remote controlled robot we've covered on Tested. Adam visits the workshop of Endiatx, the makers of the Pillbot robotic endoscope that can swim around in your stomach to map and examine your insides. Adam swallows not just one, but two Pillbots during his visit and pilots the robots around his own stomach!
The first 18 minutes give you the background on the robot. The actual swallow starts about about 18:02.