From a community Paramedic and CCT standpoint, I see great benefit in collaboration, education, and QA. For the run of the mill pre-hospital 911 service, I feel the cost is not justified nor as beneficial.
Consent is simple, if you accept care and provide informed consent, you consent to being videotaped. Consents routinely include verbage along of the lines of "you agree to be monitored and or recorded". There is also the simple task of asking your patient and explaining the benefit. Be descriptive and thorough in obtaining informed consent and you are well covered.
Implied consent can be slightly grey in comparison, but again can be easily justified. Improving quality of care by not only having statistical data benchmarks, but also visual data can be a great feat in expanding EMS research. Teaching hospitals, medical schools, nursing schools, and EMS schools videotape patient care on a daily basis
I'm interested in seeing where these go.