The lay cameraman's answer:
1) There were five monks in the video.
2) 3) It was the breakfast
4) After monks consume, the extra food is given to lay people and animals. I myself had some after recording the video.
5) Not all monks went on alms round (Piṇḍapāte). I noticed another monk apart from ven. Yuttadhammo
Bhavatu sabba-maṅgalaṁ, rakkhantu sabba-devatā
May there be every blessing. May all the devas(gods/angels) protect you.
Sabba-buddhānubhāvena, sadā sotthī bhavantu te.
Through the power of all the Buddhas, may you always be well.
Sabba-dhammānubhāvena Sadā sotthī bhavantu te.
Through the power of all the Dhamma, may you always be well.
Sabba-saṅghānubhāvena Sadā sotthī bhavantu te.
Through the power of all the Saṅgha, may you always be well.
May all distresses be averted,
May every disease be destroyed,
Maa te bhavatvantaraayo
May there be no dangers for you.
Sukhii diighaayuko bhava
May you be happy & live long.
Abhivaadana-siilissa, niccam vuddhaapacaayino
For one of respectful nature, who regularly honors the worthy,
Cattaaro dhammaa vaddhanti: AAyu vanno sukham, balam.
four qualities increase: long life, beauty, happiness, strength.
7) Monks go back once they have received enough food. The food is shared with other monks and lay people and animals.