Dē latīnē loquendō

[purasbabosadas]

There's a video on YouTube called "de latine loquendo".This could be translated literally as:"On(regarding) speaking Latin".Is de+ablative of the gerund used commonly this way?For example could I say "de vivendo" meaning "on(regarding) living/being alive"

 

[bearded]

.Is de+ablative of the gerund used commonly this way?

Yes, absolutely.
Cf. De Latine loqvendo et scribendo hodiernis temporibvs
You will also have noted that 'latine' is an adverb (literally ''in Latin'').