From what I was taught, the sensors on these great cameras are so sensitive, most of them can detect light diffraction caused by an ant fart 6 inches away ... causing that little artifact we always wonder where it came from.
The sensor alone concentrates any light, creating heat.
Using a fast shutter to photograph a sunset don't give it much time to do heat damage, however in video/live mode, the mirrors are raised giving the sun a straight path to the CMOS the entire time.
You can video once the light is diffracted good by mountains etc, but I wouldn't chance much with DSLR, they just weren't made for video, and what makes them great for video, is also the setback.
A laser of any kind is concentrated light..... that will get concentrated again by the CMOS, and even by the mirrors maybe.
So me personally won't take a chance with any laser, live view or not.
Thats just my two cents, and at today's exchange rate it isn't much, so spend it wisely!
Great forum BTW, glad I found it!