This function normalizes speed estimates based on performance profile and some information about the way the measurement was obtained (sequence, number of failures, frame skipping).
speed (double): The initial speed estimate.
failures (double): Number of failures of the tracker.
skipping (integer): Number of skipped frames after each failure.
tracker (structure): A valid tracker descriptor.
sequence (structure): A valid sequence descriptor.
normalized_speed (double): Normalized speed estimate.
actual_speed (double): Corrected raw speed based on supplied information,