That’s just a pitch bend. FL Studio offers a different way to input this information compared to Cubase.
In Cubase use the Key Editor and create a lane for pitch bend.
Set it up to show the semitone grid and expand the pitchbend range to 12 (1 octave) or 24 (2 octaves) for up and down.
Then you can draw in the changes.
Of course, your instrument needs to be set to support pitch bend. I sampled the 808 sound used in your video and brought it to a Sampler Track.
In the lower left corner set the PB value to the same 12 or 24 that you used in the Key Editor. Also switch the sampler to monophonic and legato mode (marked in the top bar).
This way I get pretty much the same sound as the dude in the video.