Just some context info:
Here in Spain, when someone cannot pay for hist mortgage, the property is seized and auctioned; then, the money obtained goes first to the bank, to cover what was still unpaid, and the rest to the owner. However, if the property cannot be sold for an amount greater than the debt (as almost always happens nowadays), then the property goes to the bank, and the debtor still has to pay most of the debt.
There was some recent "recommendation" from the government to the banks to "ask" them to cancel the debt under certain circumstances (like the debtor being unemployed, for example, if I recall correctly). What this man is asking for is to make that "recommendation" an "obligation".
Both policemen at the background wear the Catalonia's police uniform, not the Barcelona's police uniform; so the building behind them must be the Catalonia's Parliament, not the City Hall. Easy to mix the buildings, as they face each other.