The first chorus takes you through the most common approach to playing walking bass rhythm guitar. It combines a traditional walking blues bass line with simple guide tone chord accents.
In the video I play the example without a pick using my thumb to play all of the bass line notes on the E and A strings and my index and middle finger to play the chordal accents. You can also play this using hybrid picking with a pick and using your middle and ring finger instead to strike the chords.
The second chorus takes another quarter note bass line but this time harmonizes each note. This technique is something that is also more useful when playing music at slower tempos.