Here is a solution from Twilio's repository. https://github.com/twilio/video-quickstart-ios/issues/110#issuecomment-294069008

post_install do |installer|
  # Find bitcode_strip
  bitcode_strip_path = `xcrun -sdk iphoneos --find bitcode_strip`.chop!

  # Find path to TwilioVideo dependency
  path = Dir.pwd
  framework_path = "#{path}/Pods/TwilioVideo/TwilioVideo.framework/TwilioVideo"

  # Strip Bitcode sections from the framework
  strip_command = "#{bitcode_strip_path} #{framework_path} -m -o #{framework_path}" 
  puts "About to strip: #{strip_command}"
  system(strip_command)
end