So, as suggested by Frank and JBeale, I made the changes to my circuit and connected it. But I did not get any response to it. The IR LEDs were not blinking at all.
Firstly change one of the IR LEDs to a visible LED during testing so you can be sure if its working without needing some sort of
near IR camera.
Use 330 ohm resistors, not 220, those will overload the T4 pins I think. Since the load is 70mA or so you only need
4 to 7mA into the transistor base.
Which transistors are you using? Have you got the pinout correct?
From the photo it looks like most of your connections to the T4 are not made properly, just a loose fitting
pin through the unsoldered T4 through-holes - that's no good, must be soldered. Normally for breadboard use
you solder male header pins to the Teensy.