Possible triggering or strobe event for Hikvision camera.

Values of this enumeration:

• AcquisitionStart
• AcquisitionEnd
• AcquisitionActive
• FrameStart
• FrameEnd
• FrameActive
• FrameBurstStart
• FrameBurstEnd
• FrameBurstActive
• LineStart
• ExposureStart
• ExposureEnd
• ExposureActive