I'm an artist of liturgical items used in churches. This looks like the light you see coming from a skylight. The skylight and also stained glass windows are used to bring abut a known optical effect called "Lux Nova", or new light. Due to the structure and texture, the light reflected could look like an angel as the sunlight is revealed a hidden again buy clouds.
if this convergence of natural events come together to appear to be an angel blessing the deceased, thank God for the comfort it gives to the believer.
Also, by the prayers and ritual shown, this is the last ten minutes of the Mass of the Resurrection. People film everything nowadays. Baptisms, Confirmations, Weddings.... so I'm not surprised to see a funeral being filmed.
I'm sorry to see all the ridicule. God bless us all.