ROTATE & FLIP YOUR VIDEOS  
A very easy way, directly on your device!
Step 1 Choose a Video
Step 2 Set the rotation degrees
Step 3 Finish rotating video
FEATURES
# Orientation Normal
# Rotate 90 degrees
# Rotate 180 degrees
# Rotate -90 degrees
# Flip Horizontal
# Flip Vertical
# Rotate 90 degrees and Flip Vertical
# Rotate -90 degrees and Flip Vertical
* NOTE: * If you cannot save movies then please change the privacy setting. 
Open Settings -> Privacy -> Photos 
Turn on the "Rotate & Flip"