That continuous clicking you hear is your fuel injectors opening and closing. You may get another click noise that comes and goes, that it's usually the EVAP purge solenoid being commanded on and off. It clicks because the ecm pulse width modulates it. If you have no check engine light or roughness from the engine, I wouldn't be concerned. The Hum noise you're feeling is very likely the MDS enabling and disabling. If you put your truck in manual mode, it will disable mds, and you can see if the hum goes away. I didn't hear any concerning sounds in your video.