From the NASA channel:
Hand-held camera footage of space shuttle Endeavour’s external tank captured by the orbiter’s STS-134 crew as the ET falls away from the orbiter at main engine cut off (MECO) about 8-and-a-half minutes after launch.
Part 1 https://youtu.be/pdZIYbNVH9g
Part 2 https://youtu.be/zi5FVQN5oiw