I have not looked at the video. But a church building is not always required for Mass.
According to the Code of Canon Law, canon 932 “The eucharistic celebration is to be carried out in a sacred place, unless in a particular case necessity requires otherwise; in this case the celebration must be in a fitting place.” (The Code of Canon Law: New revised English Translation, HarperCollins Liturgical, 1997, ISBN 000599375X.)
From the 2002 General Instruction of the Roman Missal: “288. For the celebration of the Eucharist, the people of God normally are gathered together in a church or, if there is no church or if it is too small, then in another respectable place that is nonetheless worthy of so great a mystery. Churches, therefore, and other places should be suitable for carrying out the sacred action and for ensuring the active participation of the faithful.”
But looking up “home Masses” in the index of the book “Documents on the Liturgy 1963-1979” there are three references. One is to the 1969 Instruction “Actio pastoralis”, which has: “4. The faculty of allowing a eucharistic celebration for special groups to take place outside a place of worship is reserved to the local Ordinary or, for his own houses, to the Ordinary of religious. But, especially when it is a question of private homes or institutions, they are to grant this faculty only if the place is suitable and decent. A bedroom is always excluded.”
A footnote to this is the 1964 Motu Proprio “Pastorale munus” of Pope Paul VI. Among a list of bishop’s faculties are: “7. To permit priests to celebrate Mass outside a place of worship on an altar stone, provided the place is decent and becoming; never, however in a bedroom. This faculty can be granted in individual cases for a just cause, but it can be granted as a permanent faculty only for a more serious reason.” (Documents on the Liturgy 1963-1979, Liturgical Press, Minnesota, 1982, ISBN 0-8146-1281-4, page 259).
