One way to achieve this would be to record the audio from the YT video (Audacity could be used for this), and then load the audio file into BiaB using the Audio Chord Wizard.

Another way is the extract the audio as above and then simply import the audio file.

From the help:
A mono or stereo audio file can be imported to the Audio track, optionally merging or replacing any existing audio track. When you choose the Import Audio menu item, an Open File dialog is launched. Choose a WAV, WMA, MP3, WMV, or CDA file to import from this dialog. The Import Audio File dialog is then displayed, which allows selection of the point to insert the audio file, with a choice of whether to merge with or overwrite existing audio in the range.

However, it appears from the YT video that you have the key signature and all of the chords, so you could just enter them into BiaB and choose a suitable style. This way you won't import the melody, which would happen if you used the audio approaches above.

There are no doubt many other ways, and others will chime in with better ideas for sure.

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