The video focusses on the points discussed and practised in the two previous posts, but briefly adds a further construction to recognise.
A result clause may also be introduced by a relative pronoun, which characterizes a person or thing, rather than stating a bare outcome.
Nēmō est tam senex ¦ quī sē annum nōn putet posse vīvere. │ No one is so old ¦ who does not think / that he does not think he can live a year.
However, it is the construction with ut (…nōn) that is by far the most commonly used.
Note the final comparison made in the video between [i] clauses of result and [ii] clauses of purpose