Could a 'Nicera' IR Detector designed, "especially to detect body heat" enable my toy level cars to swarm together playing follow the human?

Imagine a teach-the-teacher class in a gymnasium where the HELLO WORLD application makes the students' cars follow the teacher as he or she tries to out wit it. (The teacher must be wearing a bikini while the students would all be dressed in their warmest winter finery.)

My 'All Electronics' catalog has IR DETECTOR for $3.90 each. Would this work? How sensitive are these things?

Ken