The video assumes that the most important and most difficult part of a SAR drone's job - object detection - will simply be solved at some point in the future.

I am a SAR volunteer, and our team has used drones on real searches. What I can tell you is that the problem is not navigation (even through forested areas), but object detection. Even for a human being, detecting humans (responsive or unresponsive) or signs of human presence (trash, abandoned camps, etc) from drone camera footage is extremely difficult.

Autonomous flying drone navigation is hard but identifying signs of human presence from onboard sensor information will be much, much harder.