A few videos show up when you search 'Mandaean' my current results are producing a large amount of videos entitled Mandaean Brakha - Prayer or some variation of that. Here are a few links I like more than others.
Mandaean baptism - A rare chance to see a baptism for most people. Accompanied by music.
Mandaean Sweden Baptism - Another baptism great to see. Unaccompanied.
Plight of the Iraqi Mandaeans - While many who come to this site are familiar with the situation in Iraq some may not be and this is a moving peace covering the topic.