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
6)
Verse 1:
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.
Verse 2:
Sabbiitiyo vivajjantu
May all distresses be averted,
Sabba-rogo vinassatu
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.